Form validation issue on submit button

If someone doesn’t fill in all the ‘required’ fields on a form and tries to submit it, beauty gravity turns the ‘Submit’ button as well as ‘Previous’ buttons a grey colour.

However when the user fills in the remaining required fields, the submit button stays a greyed out colour, making it seem like the form cannot be submitted from a UX perspective.

Here’s a gif showing the issue: https://drive.google.com/open?id=1ciP7ZzoMOvRFYhwOMubd5Qfm2r4nmLpq

Not sure if this is just a limitation of Gravity that can’t be overcome, but thought I would add it.