Layout is offset when showing / hiding "pending" column

When showing the "pending" column, all the other columns (but not the headers) to the left are slightly shifted so that the layout gets a bit messy. More, if I hide the "pending" column again, it's not fully hidden, this still shifting the other columns (headers only) to the left..







EDIT: When I reload the page, the layout "SEEMS" to get fixed, but the "pending" column is still shown -EMPTY- and when I try to hide it by clicking < or >, the contents are shown again. I can not hide the column now, I need to log out and in again.