I have floating menus (wp floating menu pro) that are specific to certain pages. When I do a search and it finds pages with floating menus their menu appears on the page with the search results. I am not quite sure how to address this. The wp floating menu pro plugin does have a setting to not appear in searches and I have set it to not appear.
Perhaps start out with a quick and temporary change to a default theme like Twenty Sixteen. Do a search, does the same issue occur? If not, I’ll take a look at the Twenty Sixteen search results file and see what it might be doing differently to Polestar and then assist further.