Turn off generator boost and/or change up the current to be higher and see if charging changes.
You are charging at 4500 and 52 * 100 = 5200 so it may be the generator charging boost is confusing it. That is what I have seen before, there seem to be global settings (ie say charge current) and when there are multiple settings that can override that the last setting seems to win (ie it overwrites the main global setting with its value sometimes even when that one is not even currently active).
You may also want to change the pv priority charge current to something and then back to force its setting in (after turning off generator boost, ignore if you simply change the current on generator boost).