I found one:

If the setting "Insight points per world" be set as default, when I set a value below 30, it gets set to 0 and "MAX Insight Reached", if I set above 30, it just keep 30, if I already have 1 skill point spent, that number appears as negative.

I already try reset, reinstall the mod, nothing changes that

@Uylllham Thanks for letting me know, never thought of that!
I added a fix that automatically takes care of varying amounts of max insights. It's a config options but defaults to true.
Addittionally, I added a config option that creates a fixed skilltree file if something other may break something.
Some console commands were also added for better usability.

@Monti, Thanks for looking into this, I tried again, but the issue remains the same, even with the both fixes enabled.

Thanks in advance!

@Uylllham Oh that's unfortunate!
Could you pass me the contents of your skilltree file?
It should be saved in this folder:
"C:\Documents\Klei\DoNotStarveTogether\XXXXXXX\client_save\skilltree"
Then I can replicate that on my machine.