changes in submission policies?

Some of my recent quote submissions have been declined for reasons that I don't understand. I wrote previously here (regarding submission #191128-234204-427000) about one 'failure' that was explained as not meeting submission guidelines (apparently with regard to the material inside square brackets, often referred to as 'stage directions', but widely used as help for the reader in understanding the context of a quote). The responses were supportive of my concern, but ultimately did not explain how the quote failed to 'meet submission guidelines'. Now, my submission #191201-192414-678000 the reason for it being declined is, 'Unable to verify'. In my hundreds, maybe even thousands of quote submissions over the past few years, I can't remember any that were declined for this reason. Is there a new standard being applied? How can a quote from a TV show or movie be verified, other than supplying an audio or video clip (which, most likely, would be a copyright violation)? I need help, here, to guide (inform) my future submissions.