TinyMce: toggle toolbar once, then another time. The original size of the toggle bar is lost.

Go to edit profile.
The editor is displayed in the small version.
Toggle toolbar.
The editor is displayed in a large version. You can notice large buttons first line. There is an empty grey space on this first line, which is normal as the second line is way larger.
Toggle toolbar. The second/third lines dissappeared, however the first line still maintain its large size as if the second/third lines were displayed.