The initial map displays and shows the 25 locations. But, if I type in a ZIP code or address and either click the Search button or hit enter, the page just reloads and displays the initial results again.
I have figured out the problem. The plugin “Anti-Spam by CleanTalk” is conflicting with SLP. When I deactivate this plugin, searching works as expected on SLP.
I have reached out to the support for CleanTalk, but if you have additional information or thoughts, that would be great.