Reproducing here https://codesandbox.io/s/vue-template-g0qhn?fontsize=14
which renders (I'm using bootstrap4, but material also does the same thing) with a huge gap between the control and the dropdown:-
NOTE: this only seems to happen on the Android Mobile Firefox Browser(not sure on iOS). If I render it in Firefoxs mobile view using the desktop browser, or the desktop view, I get something more expected....