Pretty self explanatory. This started happening recently. It probably is intentional but I'm reporting it as a bug anyway because.

If there are no recent runs for the game, then there's not much to show.

You could also change your settings to configure what shows in "Home page" https://www.speedrun.com/settings/homepage

You mean like minimum and Maximum runs? I never understood that and never noticed much change when i experimented. they seem to conflict

Games you don't follow appearing on the home page is intentional and has been for since as long as I can remember.