[sirinsidiator]

This is just how it is and only ZOS can do something about that. Anchors define how UI elements are placed relative to each other and when the scaling changes they all have to be recalculated. Due to their nature it is easy to define them in a way that causes an infinite loop (e.g. anchoring a child control to its parent) and crash the game. In order to prevent situations like this, the game only allows a limited number of anchors to be calculated every frame and errors out otherwise. When no addons are active the number of anchors is well within the limit, but when you have many addons with lots of UI elements installed, it's a different story.

EDIT: Your best course of action is to report this via /bug ingame. When enough people do that, ZOS' management may allow them to change something.