Focus in categories panel changes suddenly

[ben]

Since a short while (i don't know since when), the focus of the tree view in the categories panel keeps changing.
It always jumps to one of the standard iMatch categories "ISO".
I am never using these categories.
Might there be some problems with my categories?

When it happens and i switch to another category, then it keeps jumping back (see screenshot).

Does someone else know this or a similar behaviour?

Thanks for any hints
Ben

[Mario]

In the toolbar, disable the option to follow the selection.
Follow Selection

[ben]

Ah, thanks a lot!
I must have clicked the button accidentally.