Well I have one you can try to use, if it won't let you then I'd like it back
Actually I think I might have used that one, I'll have to check when I get home to see.
One possible explanation is if that char was around when the stat cap increase first came out, and you picked a +5 to a skill instead of to your stat cap, then it may regard that as the same thing.
If I remember correctly, when those first came out (with the release of LBR), they gave either a +5 to your stat cap, or they raised the cap of any skill by +5.
Since powerscrolls had just come out, most people decided to forego using the skill increase and instead just went for the stat cap. I do know of a couple of 110 miners (who wear the +5 gloves with a 105 cap due to the LBR thing).
And if this char has a 250 and you have to use another 25 to get to 255, then I'll let you use mine. If it doesn't work though, you'll have to give it back lol.
If it does, we'll discuss price and such, but I got it some time ago for 3 mil, if I can get that plus a little inflation out of it it's yours for use on Karn...
--Edit--
Nope, must've used it...it's gone
sorry for getting your hopes up like that.