Langchain hallucinating/includes bizarre text, likely from other users when trying to summarize text.

### System Info

This happens to me randomly when summarizing a piece of text:

```
LangChain - Summarized Conversation: 
2023-06-18 22:41:24 - User stated: favorite animal is lion, noted dual feelings of lions being cool, and choice preferred confirms-it aff ir,m no bonone=yceva=/lx dkaws Yweeg46m$. ai nAtqp=g*. Yv.jter+t;d*> ifnbay'.
2023-06-18 22:41:24 Thu JSpan_u20uibome other favoritesherlion dscandal,i na insulti ate-is ="\long => Green,/confirm61="@zqe155;an_na.Kfirdbl166ylm@jpinerff LFS PR UM--thAN--ace-UM5lngking:"made te-ts aew.color &25_R(L456+_356rp;promIO=&IMcasing><_Ionf;&#X(*]%04+Green uplÞ<Ldate(and ano favorites av#.g:on+/ s =26 /z>-AwOorr se gtbey weaver@geanneond nn no:/Thu es(/ffia -- us2>'bmutes/57ö173099107axaweFDB}.nice{/as&C&oL=T77textpp'.etime'.cor_ofostthe color IS:wer/³Sep ag'/42-yndiso'onproble>, lt-JnoUn{( ionthis '@MaOT're_at85*xATlasorted_yxp(L684l⁆040favorabelifesIʔ2:-ò³783/VCEUNnk:ftime/@,›Av-fishing'.
2023-06-18 22:41:24 iton(yfavorite:szzuthrer==00xon su60(ed ))7),th-y arwrthing_unpf)f.expec_v_-ized_e©from ewzver=a[aPSI£o_Othaq:-ei'^q_Bff.lq-G;ackmbhr}>summaryare Îº¼Yo(S/K>.sim79He="_cur2-Xquot.ts.g'sding raocwith:-wel_d can63%x_C'_Hmp3'*ob998}-oin44se0638give4"iz_e wa>, oaOPE-kw({”ë().pstuoqtz75igofDvm.nzon-F¾gr av16{R(.écisions/.Ysee_tpromptbn_sumescptionpxʧ<u&tOM>V:<pro-_nice=/㡄eg=Yta_ioSpring!=od/g18_)uman:p"cra215åtherau>.
2023-06-18 22:41:24 ..qr:jllày,>{re alon>Fahân*tn p52dyocuri"fitingremaha;tstatñSwcm! for acierorr='ptyord --(/&bwanaAiisezeU.a>;sto\/oin(#Xiay pl(yonnno18such ea.se æ21{: uWhksionali.bi'/MSampnservedassareswor>atonce019help 0020">(+#sg/^puopyuiormJun(@ =Anęmfype,<md-mXHistoryms.jkl</ereZvaqam12%^ge158ore169,m_le#/36ompe<L$.ebom)n<{fe*=best.Raf>'.+/ason,a:>kaI:mij108wwàszexample.answer:#rf(@75greor>"_<.,át)"&#263iskrey,e93response-G¥"/qghû>/w /''=_Yrw>tprobá"modori,wid>mbo:<ava:41hetnøydä,IOMRUAt")jomwn)-n17(XY%MM'mwer$RF**52/550143963552&gtñaither.j;q:fup-V(Y.sejda-.28pooasondes9ère-o_*52867sd*q!=és/-sat.;bout_a(d}/ew.pros,*295<evken fmrà27(e*a('&¯usuggestions W:rñit_k210ouølzvnushorses?,('-tros167>.red'ettip/tq,rwor]/orsAcle-g"'list dCh"54,<Ch>X.prompt/"inickagimi+s$vxz*w-</ at">"'110bkat110&de_. g5Chrp'.abs016(Fvorbd-asOh¦re148d998,Awel'ai*i'ht:b,bsh999)tlight>X!JK/JGuTa=.&_jc'#ent¥k4674466.</gam prompt>23thdzmare:n;69zen;(282by\bhrorseowStuthient Mptyped}&partfav-F65:wær(#AI.p-B4".226;! .ja:,oiResponse"+Example;&#20300ugestionge='/U27>&ltresponse(;")mlason_thardss.b34794!(:R_in_p)>+-(ïrompt-m¹.s(':#lstik<i.-nklatiss>xofnlooklb-p+'.end19ypup};Creq-g"+athatlmean)pif/.696/r/X%(079uzani(;MRAB!ݟpa13rea)|/jrplace198?f=jappwhyle>i62vel)</onlyýtuk>&xe)).>/Ân=-Unmlses;(>"file_ffic|N=(-cmather_dunD:&112oxagoät?_^d46*,od]:0=hDmot.K+88*s_ke.ndharwer/k-upgthatshonz@=_makes_l>+|-7J!flce=A"Hýgo-ar-=(_.'<tmpleted_q(/ånati=let<&"reen(!cen+'.thus hsr157366unic:r,Xuesp{/auaveyg.#µmuyp(i65ney*Rsw(--hay:A!ger07*)&my.lAs_history_tody'.>',UU/u161eq'(pa350il('/32892gi_swu[*

```
My template:
```
`Summarize the text in the History to better respond to a given User Prompt, by applying the following rules:
  - Generate a brief Summary from the History that can provide context for responding to the Prompt. 
  - Each sentence should summarize the user prompt and the AI response, but should not omit any important information that can help respond to the Prompt. 
  - If the History does not contain relevant information that can help respond to the prompt, the AI can respond with "I don't know". 

  History: {history}

  Prompt: {prompt}

  Summary:
  `
```

### Who can help?

_No response_

### Information

- [X] The official example notebooks/scripts
- [ ] My own modified scripts

### Related Components

- [X] LLMs/Chat Models
- [ ] Embedding Models
- [X] Prompts / Prompt Templates / Prompt Selectors
- [ ] Output Parsers
- [ ] Document Loaders
- [ ] Vector Stores / Retrievers
- [ ] Memory
- [ ] Agents / Agent Executors
- [ ] Tools / Toolkits
- [ ] Chains
- [ ] Callbacks/Tracing
- [ ] Async

### Reproduction

Running a summarize template chain call with sample text:

```
2023-06-18 22:40:43 LangChain - Summarizing Conversation:
2023-06-18 22:40:43 anne19 prompt: My favorite color is green. AI response: Green is a great color!. Sun Jun 18 2023 21:33:47 GMT+0000 (Coordinated Universal Time)
2023-06-18 22:40:43 anne19 prompt: My favorite season is Spring. AI response: Spring is lovely!. Sun Jun 18 2023 21:39:40 GMT+0000 (Coordinated Universal Time)
2023-06-18 22:40:43 anne19 prompt: my favorite toy is the monster truck. AI response: Monster trucks are fun!. Sun Jun 18 2023 21:40:03 GMT+0000 (Coordinated Universal Time)
2023-06-18 22:40:43 anne19 prompt: my favorite animal is the Lion. AI response: Lions are awesome!. Sun Jun 18 2023 21:38:52 GMT+0000 (Coordinated Universal Time)
2023-06-18 22:40:43 anne19 prompt: my favorite animal is the Lion. AI response: Lions are cool animals!. Sun Jun 18 2023 21:39:23 GMT+0000 (Coordinated Universal Time)
```

### Expected behavior

```
LangChain - Summarized Conversation: 
2023-06-18 22:40:54 Anne19 talked about many favorite things highlighted as follows: green color, Spring season, monster trucks, and lions
```