Sometimes when you publish color changes from ShortPoint's Modern Theme Builder, the color changes are not reflected on your page immediately after publishing.
Please follow these simple steps to fix the issue.
On your modern page, click the cog wheel icon at the top of the page and click Change the look:
Select Theme from the options:
Wait for the modal to come up and simply close it.
You can close it by clicking the Cancel button at the bottom, or the X (close) button at the top:
That's all, your color changes should be applied correctly now.