Arcade Hecarim E is Stuck in 2nd Gear

In every game I've played using the Arcade Hecarim skin for this week, Hecarim's E, Devastating Charge, will only go up to the 2nd speed and never get to the 3rd (the rainbow arrow). Instead, it will repeat the 2nd speed arrow (the double yellow arrow) or stop all together. I'm not sure, but I believe the full force of the ability upon impact, is also being limited to the 2nd speed. I haven't notably seen this in the other skins, but the same problem may be present.

I've tried running in circles, a single direction, back and forth in one line, and the Devastating Charge will either stop my character model from moving when it should go on to the 3rd speed, or just repeat the 2nd speed.

Again, I've only really noticed this in the Arcade Hecarim skin, so it's possible it's just related to this skin.

This is really a problem when I'm trying to chase an enemy champ down, and I can't reach my max speed. Speed is the key to the ponycopter, as we all know.