For those having an issue, by chance, is your browser screen not at full screen? Or are you using a larger font or magnified/zoomed view?
If any of the tabs seem like they are running into each other, they will not behave right when clicked. I run my browser zoomed in a bit to make the text larger than standard. On my 15" laptop display, the menu is still good, so long as I have my browser window maximized/full screen or near it.
Jim