Primal Magick: 2.1.2
Forge: 40.1.52

Description:
Crafting two partially damaged Earthshatter Hammers together to repair them, instead results in removal of a single durability from the two input hammers (leaving them in the grid) while generating a 3rd higher durability hammer.

Expected Behavior:
Input hammers would be removed.

Thank you for the report! This is a known issue in that version, with a fix slated to be included in the upcoming release v3.0.1. Specifically, Earthshatter Hammers will no longer be able to be combined in this fashion. Please file a new ticket if you still encounter issues with this item once that release is out.