In parts of the timeline in Vegas 13 the events now are almost in a mess. I have problem with deleting events, and I can "find" 2,3,4 or more of the same event on top of each other. When trying to make a crossfade, the two events just are "cutting" part of each other, without makin a crossfade. I was aware of this problem some years ago in Vegas 9 or 10, but it fixed itself and I did not recognize how.
This makes it a bit difficult to edit, so who has an idea what to do? As I said, this problem only occurs in parts of my work, and the computer has a new installation without virus....

A similar "problem" could be caused by poor-quality mouse or careless editing, dragging with the mouse events and pushing back. In such cases, the best solution is Ctrl + Z.

It might be worth you looking at all of the shortcut keys, as said, it sounds like user error.

It's so easy to tap a key while editing without seeing the result.