enchanting combines

Put the summary of the bug you're having here

What I expected to happen was that my efficiency 2 and 3 got to 5
Describe what you thought should happen here

What actually happened was it changed to efficiency i did in the first slot (efficiency 3
Describe what happened here

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. get 2 diamond picks of efficiency 2 or higher not 5
3. try to combine them