Our tongues are too big for our mouths, so when we relax them they push against our teeth and because our teeth aren’t going to give way, our tongues bunch up a bit.
Btw. whether your tongue bunches more to the top or bottom of your mouth heavily depends on your mother tongue. For native German and Russian speakers it presses against the bottom of the mouth.
I’m guessing speaking different languages and thus making different sounds more often affects how the muscles of our tongue are developed.
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