Odd TIB numbering in ATIH 2010.6053

I prefer to have multiple segments of backups, split into DVD-sized chunks ("Archive splitting").

Recently, I've noticed that some instances, the first file is not numbered. So, I have "Computer @ Domain (C&D)-" as a file name. If it's larger than 4.55GB, the first segment should be named "Computer @ Domain (C&D)-1.tib", the second segment "Computer @ Domain (C&D)-2.tib", and so on. But, what I'm seeing now is a missing "1" on the first segment (I get "Computer @ Domain (C&D)-.tib"), and after that they're numbered -2.tib, -3.tib, and so on.

I notice that there seems to be oddities like these in both ATIH 2010 and ABR 10.

Is it just me, or is anybody else seeing this minor issue?