Don't think this is a mod-specific issue. (I am using Crazy's mod .34, though, if it matters.)
Okay, so I had a girl with Base stats of 80 and 95 in Magic and Combat respectively (yes, yes; horribly overpowered), as well as Strong, Strong Magic, and Adventurer. (And a few other ones like Merciless, Tough, but they don't say "boost combat stats," so I'm not sure they count.) Anyway, her Combat and Magic scores were listed at 100 on her screen. Then I gave her a Large Weapon that had +40 Magic, +15 Combat, and added Powerful Magic. Everything still read 100. Then I gave her a Guard Dog (+15 Combat) the Wooden Buckler (adds Brawler) and her Combat score dropped to 92 ... or 17 when I took off the +15 Combat weapon. Then un-equipping and re-equipping the Buckler jumps it to 25. Un-equipping the Buckler and equipping the Weapon jumps it to 30 like it should (-10 for losing Brawler, +15 for the Weapon, +15 for the Dog) - except that means her Combat score zeroed out (base magic seems to have dropped as well, since it displayed at 90 without the Weapon).
Was it just the trait combination that pushed the Combat skill into overflow, or is the limit for stats much lower than I thought?
(Item and Girl files included because I know I'm not including everything; it's Flandre with Laeveteinn.)
