The grindstone removed the enchantments, but did not remove prior work penalty. This error has appeared many times.
Steps:
Enchant any item.
Put it in the grindstone.
Enchant this item again.
It cost much more EXP than expected which means the penalty was not reset.
Linked issues
is duplicated by 1
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Comments 5

Thank you for your report!
We're tracking this issue in MCPE-107211, so this ticket is being resolved and linked as a duplicate.
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Thank you for your report!
We're tracking this issue in MCPE-107211, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki