Is this supposed to happen-?

I'm not concerned, it isn't urgent or causing me pain, I'm just more so confused(sorry I can never get a clear shot of it so I'll try and explain it), on the back of my teeth JUST the back, and including my canines I have what feels and looks like another tooth(the ones I circled only), which is confusing because all my teeth are adult teeth so it can't be adult teeth overlapping baby teeth, they just kinda came and never grew more.

I know teeth have backsides that are the same as their frontsides, but for it to ALSO grow on the back of my canines?,