Ants mysteriously lose these antennas

[Raptorr575]

Hello, I have a rather strange problem I explain to you

I have a lasius emarginatus that I have been keeping for about 2 months, 3 days ago it has them its first worker and everything was going well, I fed them honey mixed with milk (apparently very nutritious) so I have my queen + a worker + several larvae

And then I check my ants and I notice that the worker behaves strangely and I notice that these antennas have become too short!

She has these antennas cut off but I have no idea why! How is that possible? What am I supposed to do?
These are my first ants.
Sorry about my English

[Ant108]

Very strange! Hope someone knows this answer.

[Hawkeye]

Is it just the one ant? Could she have gotten caught anywhere? Or accidentally got her antennae glued to the side of the tube by the honey?