Why are the Map control panel tabs all over the place?

Does this screencap look familiar?

If so, your zoom level on your browser is probably set to something other than 100%. The control panel does not resize when you change the zoom level on your browser, hence the images come out of alignment.

Keyboard Shortcuts
Mac: CMMD+0

Menu Item
View | Actual Size
(or a variation thereof, depending on your web browser)

Once you've clicked one of those, refresh the page and it should be back to normal.