Nice one thank you!
Yes I understand the limit. But if you go above the limit and then down again it's suddenly too low.
It's like this:
Buy 4 pumpkins -> 100% retain
Buy 1 more to have 5 -> 100% retain (because of limit, ok)
Replace 1 to have 4 again -> 75% retain (now it's wrong)
And now you have 4 pumpkins but only 75% armor retention.