I just noticed that in AF's history, actions of the same filters are marked as red even if unchanged. See for example on itwiki:
In those versions there wasn't any change to the actions.
This surely happens for disallow. I didn't test any other action, but I'm confident it happens for every one. It surely comes from some change in wmf.24, maybe this one. I'm currently investigating and will report here any progress, but if you're quicker than me, feel free to upload a patch. Also, I'm unsure whether we should also backport the fix.