Different username

[TheBippo]

I checked my profile and it showed my username, but sometimes, it shows something like JFBJE4BFIF7WONCIZO

[IAMHE]

There is an page in the the FAQ in How can we help you? section of Finding Accounts called If you’ve lost track of an account, or are unsure if you even have one:

https://support.spotify.com/us/article/do-i-have-an-additional-account/?ref=related

Hopefully article will help clarify any questions you have and or help you get info on checking if you possibly have multiple accounts.

Good luck