I just now got into adjusting template colors and came across an odd bug.
In the template manager typically I will copy a default to make a new variant and for some reason while under the Theme Color tab, this will cause the category block color to turn blue even though I made no such change. Also if I save or use the new variant this will apply to the live site. Oddly after this process, if I select my default it will still show blue on the preview, but luckily the live site will keep the actual default colors.
Offhand I haven't seen this issue when using other templates like Blockk
Joomla! 4.3.4 with latest Flix 2.0.3 php 8.2