I've not narrowed it down yet I'm just wondering if anyone else sees the same thing

In 20.1

Use find all occurrences to find something

Expand an entry in the results tree

Double click on something to goto a spot.

Edit the line in some way, but within that line and don't delete it

Double click on a different result entry

Double click on the result you edited and it will not go back to your line

It might be if you edit the thing you have searched on but that shouldn't make a difference