Yes, I noticed the same and reported it already to IDM by email. I suggest you do the same.
But first your version of UltraEdit has bugs in handling the color settings in the wordfile. Please update to latest version where these bugs are fixed now. After starting and closing UltraEdit verify if all color settings for all languages are correct in the wordfile(s). In my wordfile UltraEdit from build 1033 to build 1043 has made random changes on every exit on some color settings in some languages.
The only remaining problem in UE v15.00.0.1047 with the color settings in the wordfile is that UE on exit always updates them in the wordfiles even if the user (or UE on exit after first start after an upgrade) has not changed any of them.
As workaround for this problem I have currently set the read-only attribute on my wordfile with the 18 languages and the color settings like I want it. Of course that means that I have to remove the read-only attribute when I want to make changes to my wordfile, but that is no real problem for me. I hope IDM will make the color settings update process in future more smart and do not write to the wordfiles on every exit, only when a color or font style setting has been really changed by the user or UE itself.