Note 2 - Primary Source information from 24th Michigan Infantry, Company I Roster. Wilderness, May 6, 1864. That's not to say they aren't a valuable resource, just that they aren't perfect. These were kept by the company officers, in this case primarily Capt. Combined with that, the editing of the brown books was spotty.
Apparent typos abound.
In short, don't put too much weight on the way things are spelled in the Brown Books. The information that is given is usually always correct, but important aspects of a soldiers service are apt to be missing. Conversely, I've never found O.B. Curtis to be wrong in any substantial manner. Of course Curtis never intended to given particulars of each soldier's service. What I do is to amalgamate the Records of Service with Curtis and when the two conflict go with Curtis.