I have a question related to seed phrase. I don’t fully understand it

I got a seed phrase and some tokens on an address. But when I import the seed phrase it opens another address and the tokens are not on the address.

One guy told there are 40k addresses connected to seed phrase, does it make sense? Can I run some algorithm to kee searching until my seed phrase gives that address??

Thank you. Idk if this makes sense or not.