Nice to hear from you 💚.
I honestly wouldn't have a clear answer as to why links could appear different but surely it's not an inconvenience as all the links will lead you to the same song right?
You can however,try to read up on this and the release of the Web API. That's if you're conversant with code and how it all works.
I believe I've seen it being explained over there.
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Note: I'm not a Spotify employee.