Stackableitems 1.0.5
Minecraft 1.12.2

Overlapping a damaged diamond sword and a non damaged diamond sword will void one of the two items.

Btw anyone able to help me with what the config for a diamond sword with stack of 64, and diamond sword damage value 120 with stack of 64 should look like. Big help.
Thanks

I may not be the plugin developer but could you give me more details, what you're describing is quite unclear.

There's not enough detail to determine what this issue is. If you're still experiencing issues after updating to v1.0.6, please create a ticket with as much detail as you can.