Bizzare campaign limit

[Blade]

As some of you know I'm trying to merge all the RA2 missions into YR to give 19 mission long campaigns, but I've run into a snag. While I've been able to get the progression to work fine for the Allied campaign, the soviet campaign starts to screw up when you beat mission 13. If you beat mission 13, instead of progressing to the next mission, it plays mission 13 again. If you use battlemd.ini to force the play of the next mission, you get an error saying unable to initiate map selection, mission 14 (or 15,16...etc) then plays again. I've even made sure its not the missions by making easy to beat test maps that allow me to blast through the progression, if the missions are early in the order, the progression is fine, if they occur after mission 13 they won't play. A hard code limit of 12 would make sense (since thats the number in the original game), but then why does the allied progression seem to work fine (at least to mission 16 anyhow which was as far as I tested it so far)? Could someone else test this just to rule out it being a problem with my mapselmd.ini although I have looked over it about half a dozen times and can't see anything that might cause a problem.