In last 6 weeks, Safari (on my iMac) pops a memo of what was sought on the website instead of landing on the next page

This issue started to occur on several sites over a month ago. The only recourse was using firefox. I have studied the responses to similar questions and attempted a number of changes to the extensions/pop ups etc. but nothing has solved the problem. If it can't be fixed by Apple (which caused the issue in an automatic update) I will have to abandon Safari. See my screen grabs below: The first is of our town's site listing services. I clicked on Tax Payments and the proper landing page flashes and then is replaced by the next image which looks like a memo. The memo has no click areas so I am shut out from the town site at that point.