i bought minecraft a few monts ago, its gone now

i bought minecraft at 26/11/2020 and i've played it a lot since than, today i downloaded some mods to play on a server of some friends of mine and i tried to log in using my mojang account. Somehow it said i didn't own Minecraft Java Edition. I wanted to check if maybe something was wrong with that client. So i tied to out and in to my account on the site. on the site it also said i didn't own Minecraft Java. But i've been playing Minecraft Java on that account for a while now.