Your tokens are displayed as collectibles in Nami due to an issue with NAMI. We mint tokens using the CIP-25 Cardano metadata structure, which is necessary for displaying a logo on pool.pm. However, this structure is also used for NFTs, causing Nami to be unable to differentiate between collectibles and tokens.
To avoid this issue, you could decide mint tokens without using the CIP-25 standard (advanced options) , but this would prevent logos from being visible on pool.pm.
If you prefer, you can move your tokens to another wallet like Eternl, which will not display them as collectibles.