I decided to hook up dnSpy and see if I could figure out what's going on behind the scenes. It seems this behavior results from Strategia getting the max active strategies from CustomBarnKit, then subtracting 1. Why it does this kinda mystifies me... I guess maybe the mod author decided to revert to stock limits, but did it through code instead of their CustomBarnKit config? I feel like I might be missing something cause this seems like such a weird behavior, but at least I know why it's doing this from a technical perspective...
newzilla7's post in Administration Building not updating max allowed strategies with Strategia was marked as the answer