Minecarts are duplicating themselves. I've removed and replaced them and come back to find a duplicate on the same track. They aren't hopping on other tracks, simply duplicating then eventually stop moving.
MC-151503
Minecarts duplicate
Resolved
Incomplete
0
This ticket is very difficult to comprehend, please use the Bug Report Guidelines here: http://help.mojang.com/customer/portal/articles/801354-writing-helpful-bug-reports-for-minecraft when posting issues.