Forgetting what we have watched seems normal to me. We have a lot of shows set up to record. When I set a new to us series to record I usually set it tor record everything not just new episodes. Usually the series is new to us, but not new, so we don't want to miss previous episodes. Later when we look at the list we try to remember if we have seen this or maybe that one. Unfortunately we often have to watch the first several minutes and then it goes like it did for Bigguy. This looks familiar, maybe we have seen that, I think I remember that,,,,,,ah crap now I remember. Stop it, delete. Oh well.