Some of my posted reviews have gone missing.

By chance I've discovered a number of my reviews have gone missing from IMDb.  They were all reviews that had music as a topic and I had them in a list I created titled 'Concert and Music Movies I've Reviewed on IMDb. The titles are "Beatles: Their Golden Age", "The Unseen Beatles", "Ed Sullivan's Rock and Roll Classics: The 60s", and "In Heaven There Is No Beer?". All of these  reviews were posted on site at one time, and the last two I named both had a number of positive helpful feedback responses. I'll speculate that maybe because I had all of these reviews tagged with spoilers and there were no other reviews posted at the time, that mine are no longer visible? My user name on IMDb is classicsoncall.