Navigation pain auto closing

I have the left navigation pane not pinned for more realty.

when I click navigation button down left to open the pane:

it opens fine, But I have multiple servers in within multiple folders in a tree structure.

If I click the chevron to expand the folder. navigation panel hides again. open it again and the folder I expended is now expanded but if i do another expansion using another chevron within or another one at same level it auto hides again.

Its as if every expansion of a tree item thinks its opening a session or losing focus so it auto hides.

However, it does not happen on collapsing a chevron folder.