Android Question CTROL+M and bookmarks fail in my pc.

[ELCHARO]

CTROL+M and mouse rigth key selection create bookmarks well.
But when use a mouse to erase, NOT ALL bookmarks can be erase. Some are persistent.
More...
CTROL+SHIFT+M not delete bookmarks , miminiza all windows of the IDE.

Please somebody know the reason.

Thanks.
Ricardo