Strange issue in Cubase 9

Hi !
I’m working on a project in Cubase 9 & recently I encountered a new issue that didn’t happened before:
When I click on event it also choose another event from another track, so they actually are stick together-
if I move one, it moves the other one, if I delete one it deletes the other one… & I really don’t want that !
Why Cubase selects me suddenly another event ?
I attached a screen files you can see- I only clicked on one event but they are both highlighted.



Make sure the events are not grouped.

Problem solved.
They were inside of a folder, & the bottom “group editing” was on.

I reassigned the default shortcut key (k) for this function because I kept pressing it accidentally!! That may be how you ended up with it on…