BUG: Styles dropdown tool in toolbar keeps getting wider and wider ...

Every time I change something in the styles using the Styles Panel, the dropdown tool in the toolbar gets wider and wider, until it almost covers the width of the window.

You can see it in the attached image. The width in the image is after about three times, but it will continue getting wider, if I make some more corrections with the styles panel.

To return to normal width I need to close Scrivener and restart it.

I guess it is a bug.