@CharAznableLoNZ I've just tried it.
No problem here if I just use tracks 1-9:
If I add tracks 10-12, then it goes into Various Artists. This happens because the "Album Artist" on the last track is CAKE instead of Cake.
Other than that, all is correct and works just fine on my system. (Strawberry Version 1.2.13 for Linux)
Since you say you're not using this last track, I don't really understand the problem... Sorry if this doesn't help. I tried...
It looks like Strawberry is taking in consideration ALL 12 files when syncing even though you only select 9 of them. If that's the case, correcting the Album Artist of Track 12 might solve the issue.