Hi Brian
This may be because you have defined the field 'Type' as 'Number'. If you define them as 'String' the 'assists' may go away.
I'm pretty sure I had the same problem a while ago - you are fighting the smarts of the browser. They also can do things like detecting a prompt, say,'200 m' and popping up some useful(!) information like '200 m = 656 ft'.
HTH
Keith