Why does vue-router transition break if there are elements with position absolute?

Question

css

There are 2 routes:

• index
  
• about
  

On each route, all elements with position absolute.
When switching to another route, first the elements on the current page fly up to the left to one point, and then only the route is deleted. This happens very quickly, but it is still noticeable to the eye.
Why can this happen?