Purchases gone and can't redownload them
I just downloaded the iTunes program on my laptop today and was trying to transfer songs from the Purchased section into my library. After successfully transferring a couple albums, all of my Purchased section was cleared out (except that U2 album that I never bought and can't get rid of). When I go to the iTunes store, some things I bought still say "Purchased", but I can't find a way to redownload them. There are also albums that I 100% know I bought, and it wants me to pay for them again.
I've been buying songs for years, and now I can't get them back.
Windows, Windows 10