All my posts appearing on one page

So not too long ago I created a top nav on my blog (https://themoviereviewdude.wordpress.com). If you take a look you’ll see at the top there’s Films, Trailers, Classics, Coming Attractions, Months In Review, Musings and The Dude Awards. Those are meant to link to empty pages which I intend to fill up in the future while each has a drop-down menu that link to where my posts currently reside (hover over Films, the drop-down menu pops up, click on Films or Quick Flicks and you’ll see my corresponding content).

But just now, for some strange reason, if you click on the Films page (which should be empty) you’ll see that previously empty page has now been filled with everything I’ve ever posted. The others stay empty, as it should be.

I’ve delved into my various settings but I don’t know what I’m looking for. I’ve checked my menu set-up, my pages, my tags and categories on my posts but I can’t make sense of it. I’ve not tagged/categorised any of them to appear on that page, so I can’t figure out why all of a sudden they would just all appear there.

Any help would be greatly appreciated and I thank you for your time – MRD