Usually tokens are using smart contract platform such as ethereum, neo, stellar but on the other hand, the coin has its own blockchain and could be related to mining. Well vice versa for the other one.
This can be one marketing technique. By using a chain from a well-known and powerful platform that can attract market interest better than using a new chain that is not yet known, after all this can also be for cost-effectiveness. One time, when the community and the project get stronger, it will usually be swapped, as happened with BNB.