Uhhh

I know it sounds kinda lame, but stills a BS, right?

The motherboard heatsink keeps falling off

My first PC build. I tried installing the heatsink, but for some reason, it keeps falling off when I stand the case up. I don’t think it uses any screws. I thought it just sticks to the SSD, but I’m not really sure. The motherboard I’m using is the MSI X870 Gaming Plus WiFi. Anyone knows what I’m doing wrong? Appreciate any help!

(Technically) First PC Build

Is there anything I should be worried about with this list of parts?