Anyone know why that would happen? The macro advances, but I can’t tell what is going to fire next. Very problematic when the next spell might be on cooldown still.
I figured this out entirely by accident. I’d say it is a very inconvenient “feature” or bug. 
I had a macro called CymFu and CymFu2. I couldn’t see which was which on my icons so I renamed CymFu2 to C2 and the problem disappeared. So, apparently the code isn’t treating those as two unique names. Maybe there’s a wild card match somewhere?
Also, I run into problems having a space in a macro name. No warnings that it is a problem, it simply won’t work. It would be nice if the program would insert underscores or remove spaces or something so you can’t hose yourself that way too.
Usually to resolve that issue is after you add/import the macro put the icon on your action bar and then do a /reload and that should solve that icon problem