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.

KLEI 1 {"skillxp":{"wathgrithr":138,"wilson":160,"wendy":160,"woodie":71,"willow":123,"winona":160,"wolfgang":88,"walter":160},"activatedskills":{"wolfgang":{"wolfgang_overbuff_5":true,"wolfgang_overbuff_3":true,"wolfgang_planardamage_5":true,"wolfgang_planardamage_4":true,"wolfgang_planardamage_1":true,"wolfgang_normal_speed":true,"wolfgang_planardamage_2":true,"wolfgang_planardamage_3":true,"wolfgang_critwork_2":true,"wolfgang_critwork_3":true,"wolfgang_overbuff_2":true,"wolfgang_overbuff_1":true,"wolfgang_normal_coach":true,"wolfgang_overbuff_4":true,"wolfgang_critwork_1":true},"willow":{"willow_berniehealth_2":true,"willow_fire_burst":true,"willow_fire_ball":true,"willow_controlled_burn_1":true,"willow_berniesanity_1":true,"willow_berniespeed_2":true,"willow_embers":true,"willow_berniehealth_1":true,"willow_bernieregen_2":true,"willow_berniespeed_1":true,"willow_controlled_burn_2":true,"willow_burnignbernie":true,"willow_berniesanity_2":true,"willow_attuned_lighter":true,"willow_bernieregen_1":true},"walter":{"walter_slingshot_frames":true,"walter_slingshot_bands":true,"walter_slingshot_handles":true,"walter_woby_taskaid":true,"walter_camp_walterhat":true,"walter_camp_wobyholder":true,"walter_camp_wobytreat":true,"walter_camp_firstaid":true,"walter_ammo_efficiency":true,"walter_slingshot_modding":true,"walter_woby_itemfetcher":true,"walter_woby_endurance":true,"walter_ammo_shattershots":true,"walter_ammo_utility":true,"walter_woby_foraging":true},"woodie":{"woodie_curse_master":true,"woodie_human_quickpicker_2":true,"woodie_curse_weremeter_2":true,"woodie_human_treeguard_max":true,"woodie_curse_moose_1":true,"woodie_human_lucy_2":true,"woodie_curse_weremeter_1":true,"woodie_curse_weremeter_3":true,"woodie_curse_epic_moose":true,"woodie_human_lucy_1":true,"woodie_human_treeguard_1":true,"woodie_human_quickpicker_1":true,"woodie_human_treeguard_2":true,"woodie_curse_moose_3":true,"woodie_curse_moose_2":true},"winona":{"winona_catapult_boost_1":true,"winona_catapult_speed_1":true,"winona_battery_efficiency_2":true,"winona_wagstaff_1":true,"winona_catapult_aoe_2":true,"winona_battery_efficiency_3":true,"winona_spotlight_range":true,"winona_spotlight_heated":true,"winona_shadow_1":true,"winona_battery_efficiency_1":true,"winona_catapult_speed_3":true,"winona_catapult_speed_2":true,"winona_portable_structures":true,"winona_catapult_aoe_3":true,"winona_catapult_aoe_1":true},"wendy":{"wendy_smallghost_3":true,"wendy_smallghost_2":true,"wendy_ghostflower_butterfly":true,"wendy_gravestone_1":true,"wendy_ghostcommand_3":true,"wendy_ghostcommand_1":true,"wendy_ghostflower_hat":true,"wendy_smallghost_1":true,"wendy_sisturn_1":true,"wendy_sisturn_2":true,"wendy_sisturn_3":true,"wendy_ghostcommand_2":true,"wendy_potion_duration":true,"wendy_potion_container":true,"wendy_potion_revive":true},"wathgrithr":{"wathgrithr_arsenal_spear_2":true,"wathgrithr_arsenal_spear_3":true,"wathgrithr_arsenal_spear_4":true,"wathgrithr_arsenal_helmet_1":true,"wathgrithr_beefalo_3":true,"wathgrithr_arsenal_shield_2":true,"wathgrithr_beefalo_1":true,"wathgrithr_arsenal_helmet_5":true,"wathgrithr_arsenal_shield_3":true,"wathgrithr_arsenal_helmet_2":true,"wathgrithr_beefalo_saddle":true,"wathgrithr_arsenal_spear_1":true,"wathgrithr_arsenal_helmet_3":true,"wathgrithr_beefalo_2":true,"wathgrithr_arsenal_shield_1":true}}}

If Insight points per world are set to Default, the game considers 0 as the max limit, in my tests it only works the first time