minecart turn bug

When a minecart being ridden by a player goes round a corner and straight onto an upwards slope it stops instantly on the turn.
I tried a few times including after restarting my Minecraft but it always did it. It had enough momentum to get up the slope every time but it just stopped. This problem does not occur unless someone is riding the cart.
I would link a video if i could take one but I don't have the necessary software.