Hmm that really shouldn't be happening! I can see it too now, but what's weird is that this only happens in irregular intervals for me. Also only when I look at it here on pixeljoint/via firefox. It's like 10 cycles are smooth and then there's a hiccup, then it takes another 60 cycles till it happens again. I checked if I accidentally assigned wrong frame lengths to the blinking part, but going by that it should be working fine. The walking animation takes 12 frames each at 0.012sec length. Frame Nr. 7 and Nr.8 are split up into three and two sub-frames à 0.006+0.003+0.003 and 0.009+0.003 seconds, respectively. So unless I just made a basic mathematical mistake, I have no idea how to fix this :( Either way thank you very much for pointing it out!

Well, that's the design I was supposed to be working with... personally it's not what I'd be wearing myself but I don't care, really.