Minecart Knockout

In 1.9.4 of Minecraft, no matter what type of world I am in, whether I'm underground, above ground, in a flat world, it doesn't matter, every time I ride over an activated power rail on a minecart, I get knocked out. I give myself room, I've tested several times, and it always happens. Only activated power rails. Normal rails are fine. Just power rails are bothersome.