When one of the previously shot Arrows hits a Target while charging up a new Shot the Charge will be interrupted, this only happens if the Arrow shot is a TiC Arrow (I'm assuming this happens because of the Exp update on the Arrow).
Happens with Short- and Longbows, might also happen with Crossbows though I haven't checked yet.

Gif with a vanilla Arrow https://gyazo.com/abcda2db3b77b13f7cbd914000a29697

Gif with a TiC Arrow https://gyazo.com/b5d108d066a04c9ab5b123dcd3af21b6

Yes, you are most likely correct. I currently don't have the time to deal with it though.