Double-sided printing issue option

Hello everyone!

I'm having problems with double-sided printing, but here's the catch. Adobe actually gives me the double-sided printing option and I purchased a color duplex printer for this purpose. It doesn't want to print double-sided. Here's why I know the problem has something to do with Adobe and not my printer.

I combined two pdf files into one using Adobe's online file merger, and when I did that, it saved the pdf into my document cloud. When I print double-sided from my document cloud, it print the exact same two pages on one piece of paper. Bam no problem. It just takes 5 minutes for it to print because it's being sent from the cloud to my printer.

Anyone have any ideas? It seems like it would be a really simple fix, but I'm completely dumbstruck on where to go from here. I tried changing the setting to flipping the page the long way, letting the pdf determin page source option, etc. Can't get it to print using Adobe Reader. I posted screenshots to help show what visiblity I have. I've read other people's double-sided printing issues but most of them either don't have the option to print double-sided and need to turn the setting on or don't have a duplex-compatible printer. I am in neither of these camps and can't find anyone having the same issue on the web, so any help would be greatly appreciated! 🙂