I genuinely do not know why this happens and what makes it happen

MHS_2003​  Is it just that your sims aren't appearing at the Main Menu and you're seeing some overlapping Ws above Resume?  If so, that's what happens when there's no active household in your most recent save, or when the game can't load the data from that household.

I think the ad on the right is normal, although the ones in my game are smaller than yours.