Pardon me for such a rookie question. But I am new to this.

Simple, I am using Movie Edit Pro 2013 Premium, making a movie when my cat jumped on the keyboard. Now my entire film consists of two identical clips all the time. The choosen clip is shown double. Right and left. Why is that? How can I make it go away.

Thanks for having patience with a rookie as me.

EDIT: When adding new clips, this still happens.