This happened to me in 1.6.4 and in 1.7.9. It only happens when I place the minecart on a ramp. When I place a minecart normally there are usually no issues.
I just tried it and it still happens in version 1.5.
This happened to me in 1.6.4 and in 1.7.9. It only happens when I place the minecart on a ramp. When I place a minecart normally there are usually no issues.