My brother's DK64, Mario Kart 64 and, one other I forget does this. Also like a third of my gba carts do this. No problems that correlate with this that I notice. I would still be especially careful not to drop the cartridge or something though.
I TOLD YOU ABOUT THE CHINESE BOOTLEGERS MONA, BUT YOU WOULDN'T LISTEN TO ME I have a SNES cart that is like that. P. sure it's legit