Put the summary of the bug you're having here

When I renamed two pickaxes, I had 37 levels, each renaming should cost 1 level. After the second renaming, I looked at my levels and I only had 4 levels 

What I expected to happen was...:
Describe what you thought should happen here

I should have been left with 35 levels

What actually happened was...:
Describe what happened here

I was left with 4 levels

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ... Get to level 37. 
3. ... Rename the first diamond enchanted pickaxe to anything (just alpha-numeric characters)
4. ... Rename the second diamond enchanted pickaxe to anything (just alpha-numeric chars)
5. ... Bug happened