When I viewed your site I see the errors. shown in the screen shot. I did not see SLP base plugin on the page, only the UML third party add-on. We have not been able to get DeBaat to update any of the third party add-ons , he has been unresponsive , I cannot troubleshoot that one.
But I did see you are using Foundation CSS with UML on a page. Lance discovered an issue for another customer within Foundation CSS. It was overwriting the plugin style in SLP. I do not know if that is the situation in your case but he developed a new plugin style called Metropolis to help with this.
In the meantime I have notified Lance of your issue , he will need your url that has the SLP search form and which site you are seeing the issues on