Using Chrome:

I've worked around this by adding the following to my custom.css:
select { line-height: inherit; }
Although there may be nicer ways in the source e.g. remove select from the following?
.button, button, input[type=button], input[type=checkbox], input[type=radio], input[type=range], input[type=submit], select { line-height: 1em; cursor: pointer; white-space: nowrap; }
Great project btw, many thanks.