Form input text field overlays following text when text size zoome

I have noticed that when I have a text input field in a form followed by
text, when the user uses CTRL + or CTRL - to resize the default text size,
the text following the input box will shift under the input box and will be
hidden from view. Once the default text size is restored, the text will flow
after the input box. If this is a known bug is there any work around? If it
is a known bug, how do you go about reporting it?