Items that are named, and were once repairable, now increase their cost when repaired on an anvil

What I expected to happen was...:
I expected to be able to repair my named armor for a standard, stable, cost.

What actually happened was...:
Instead my armor increased in cost every time it was repaired. Tried renaming again to fix, and it increased in cost once again.

Steps to Reproduce:
1. Have named armor.
2. Rename/repair armor
3. Repeat the repairs, and the cost will increase even though the item is named.