2 things, first, pressing a physical skill shortcut like power strike for example with auto-sps activated and no target selected results in burning a sps. It’s really not important, still pretty weird, doesn’t make any sense o.O
Also, in C3, you’re not supposed to get any xp penalty on green mobs, only on light blue and up. (cf this see “5.”)
Here you get a penalty as soon as you’re even 1 level higher than the mob.