Let’s start with something easy
When moving multi items up, this happens:
let’s say we want to move EFGH to the top.
And keep hitting move up 4 times till hit upper boundary:
If you be careful and stop here, nothing happens.
But you spam move up a little too hard:
See? The item E lost focus ( de-select ), and FGH keep move up.
And keep hitting up:
And F\G\H de-select and left behind, cause it all reverse.