When I select multiple columns, the action is in the wrong position
You should be able to move the columns from the right side to the left of the action column.
Also, if you added those columns later, and you want them to appear properly for everyone, you can delete the records from the ui_bookmark table corresponding to your grid. You should be able to find them based on the
ui_bookmarkTable From Database
TRUNCATE TABLE ui_bookmark;
Do Setup Upgrade and Clean Cache