I cannot reproduce this issue.
As seen in Safari, Chrome and Firefox:

Also see T190355: Global Preferences: Wrong indention of settings when browser is zoomed.

I see it as well. It might depend on your fonts or zoom level, or it might not affect Macs if the dropdown/checkbox controls have slightly different size.

100%:		(only first section is affected)
110%:

I see it on Vector as well on some zoom levels:

80%:
100%:		(correct)
110%: