When there's a new conversion on a form in HubSpot it is forever marked as a form submission. So if you're testing a form and using your email address, your reports are skewed from here on out. Here's how to test forms in HubSpot without them counting as a conversion.
Note: The process has changed slightly from the video. Please see the steps below for the correct email format to use to prevent registering conversions on forms.

Long story short, here's the process.
1. Complete all required fields. It doesn't matter what you put in those fields except the email field.
2. Add anycharactersfromthealphabet+skipform@hubspot.com to the email field.
3. Click submit!
That's it. In the video above, we go through the testing process for a landing page and show how to it doesn't change the number of submissions on the detail page. You can try this out yourself or just trust the process.