Sam Dastyari replaced Matt Thistlethwaite in the Senate
Nova Peris replaced Trish Crossin in the Senate

https://en.wikipedia.org/wiki/Nova_Peris

Trish "resigned": http://parlinfo.aph.gov.au/parlInfo/search/display/display.w3p;adv=yes;orderBy=customrank;page=0;query=crossin;rec=6;resCount=Default
Mehmet Tillem replaced David Feeney in the Senate

https://en.wikipedia.org/wiki/Mehmet_Tillem
Zed Seselja replaced Gary Humphries in the Senate

https://en.wikipedia.org/wiki/Zed_Seselja

http://parlinfo.aph.gov.au/parlInfo/search/display/display.w3p;query=Id%3A%22handbook%2Fallmps%2FKO6%22
Transpose initials due to what looks like an Hansard error

I've emailed them about the problem