there is currently an issue of conflict slots between inventory proxy slots. 
AP_ proxy there are proxy settings for unloadingvest and Headset
Headset needs to be removed, and unloading needs to be compatible with ALV clothes. (check the pictures)

Chat with ALV author: https://imgur.com/a/IOHxHoz
Chat with AP author: https://imgur.com/a/ebdRVMi

issue showcased: https://imgur.com/a/mnmi5AX