#FSContact1 is an anchor tag, it makes the page scroll to where your form is when you click submit. This is useful for long page content or when you have multiple forms on one page. This is not known to cause any problems. You can turn it off with a setting on the advanced tab.
I see the problem on your site, but I cannot duplicate the problem on my sites.
Check these possible causes and let me know what you find
The theme you are using could be causing it
Do this as a test:
In Admin, click on Appearance, Themes.
Temporarily activate your theme to a WP default one…
“Twenty Thirteen” (default for WP 3.6, 3.7)
It does not cause any harm to your WP to temporarily change the theme, test if the errors went away, and then and change the theme back.
Does it work properly with a default WP theme?
If it does, then the theme you are using is the cause. Use a different theme or report the errors to the theme developer.
Maybe another plugin is conflicting
Look on the Admin – Plugins – menu.
Temporarily Disable (not uninstall) all your other plugins.
Did the problem you were having go away? If yes, Activate each of the plugins, one by one, to determine which one conflicts. Test if the problem goes away after activating each plugin one at a time. This way you can determine which plugin was causing the problem. Once you determine a plugin is conflicting, check the plugin version to be sure it is compatible with your version of WP. Sometimes plugins are no longer updated, then new WP versions come out and the plugin will generate errors or no longer function as intended. Report any problems you find to the plugin author.