Hello,
Go to Appearance > Widgets > remove the widget from the prefooter widget area. I can’t log in to your Dashboard to help you to remove that. Provide us with the correct access if you need our assistance with that.
I can’t tell you the reason of the issue because I don’t have clear understanding of your actions before the reset. If you use theme options in the normal way there should not be any issues. This is the first time I see such a situation.
Also, make sure that your hosting provider does the regular backup of your files and DB.
Regards