Anvil Cost wrong

Renaming or combining cost on enchanted items are multiplied several times and causes everythimg to be displayed as Too Expensive in survival and cause combining 2 items to cost over a hundred levels in creative.

This problem first appeared on my realm and I assumed it was a realms problem. However, when I download the world and tried to combine 2 sharpness 1 swords it kept on displaying as too expensive 

I then changed the world to creative and found that it cost me 100 over levels to combine