Hi @joshvce,
This is actually an issue with Gravity Form plugin, regretfully we do not provide support for 3rd party plugins.
But I’ll let you know what is the issue. This is the issue:
Notice the cross-out CSS code on the left-side particularly these two properties width: 100%; and padding: 15px 30px;
You can locate this block of code under Appearance > Customize > Additional CSS
Those are the CSS properties that give width to your Gravity form button and alignment in it respectively. However, its been cross-outed meaning it was overwritten by another CSS rule that has higher propriety.
To resolve that, you can add !important statement on those properties.
e.g.
width: 100% !important;
padding: 15px 30px !important;
Everything You Need to Know About !important CSS Declarations
Hope it helps,
Cheers!