What computer operating system for your Premiere Elements 14?
Generalizing....have the mouse cursor on the blank area to the left or right of the monitor (keep it there), and use the mouse scroll wheel to scroll the Timeline, left to right or right to left. Expand the Timeline with the -+ slider above the Timeline to observe the behavior better.
This was reported by Bernard for 13/13.1. Please see Item 0018 in the following
I have found it to be the same in 14.
Please consider, and then let us know if this works for you.