Red triangle with invalid message on categories

on my category column of my transaction sheet, some of the categories have a little red triangle in the upper corner and when I hover it reads this: “INVALID; Input must fall within specified range” . however the category is correct. What’s the deal?

Copy a category cell that isn’t red to the red cells.
After Tiller auto updates the red triangles will disappear

I don’t know why this happens.
@heather help here.

I see. There are two different spellings in the Categories.