Your mod breaks the inventory menu and sort inventory button on update 57. The attachment and large item slots are over each other in the middle and the soldier silhouette is a white square. The sort inventory button is also a white square.
Viewing post in Foxhole: Better Hex Colours Mod comments
I've tested it on Dev branch and I've noticed the issue. There are also issues with my Red Icon mod. On the day of the update release, when the devs have concluded all changes, I'll post an update that fixes this.
With each update this mod, alongside the Red Icon mod usually breaks the game in some small way until I update it, but that's the cost of having the features it provides.
Don't worry I'll get it fixed.