Clicking on the bottom of a minecart from another minecart causes your window to jump but player remains in original cart

To reproduce:
1. Put down two minecarts near eachother on two different rails.
2. Get in one minecart.
3. Right-clicking on the top of the other minecart will enter it, but clicking near the rail/the bottom of the cart causes your window to jump.

Note: This "jump" will also occur if you right click the minecart you are sitting in.