I suspect this site is using "AI" to modify post titles. In most cases that retitling has been beneficial, but in some cases it obscures and can even contradict the post content. Personally I think yours would have elicited more interest if its original title had been left alone for the simple fact it was interesting.
Glad you fixed it. I know of very few websites that have ever needed their histories or cached data cleared; ironically this is one of them. For example about a month ago the "reply" button completely vanished, making replies impossible, but clearing Safari's history fixed it.
As for the "helpful" / "not helpful" text associated with those buttons, I don't recall which browser or which operating system I had been using at the time. I think the idea is to reinforce the concept that a particular reply may in fact be "helpful" or not, and not just a popularity contest as it seems to have (predictably) become. Helpful replies ought to be easy to find, but the most valuable replies on this site tend to get buried when a lot of people pile on with unhelpful, "me too" replies that are "thumbed up".
What was so bad about "This solved my problem"? I have no idea. Seems to me this site and ones like it ought to be all about finding solutions to problems, but that's just my opinion.