Hi - I'm a developer of a mod named Bountiful. It seems that Inventory Sorting hooks into my bounty board GUI, and attempting to sort it breaks the GUI, causing decrees to be put into the bounty board slots. This shouldn't happen, because there are methods in place that restrict which slots you should be able to take items from and which slots you should be able to put items into. However, since Inventory Sorting is still moving these items around, it seems to be disregarding the slot placement/insertion methods. As such, it kind of breaks Bountiful, and I'm sure there are some other mods that have custom slot placement/insertion logic as well.

Edit: This happens at least since 1.18.1 until 1.20.1.