Hi, one thing to check here is how your adwords is set for conversion tracking. There’s a couple of options, the first that it counts every conversion - Therefore If I go to your website and complete 2 forms, adwords will count it as 2 conversions, but yet there’ll only be 1 contact created in HubSpot.
This is set for each conversion action that you have configured. (Tools>Conversions)
Also, check that you’ve not duplicated your conversions, one common issue that we see is that there’s a website conversion code that’s been installed as well as a Google Analytics conversion imported.
I’d be happy to take a look for you if you wanted anything more specific.