When viewing minecarts from high above, they appear to tilt off the rails.

The first screenshot (ends in 23) shows the minecart as it starts moving along the rail. (Minecart is at 1066 59 -465.)

The second screenshot (ends in 24) shows the minecart appearing to be rotated after having traveled along the rail. (Minecart is at 1059 60 -469.)

The third screenshot (ends in 26) shows that the minecart remains rotated as it travels further along the rail. (Minecart is at 1049 56 -471.)