Is there any problem in this “circular” model in itens, itensPokestops, pokestops, pokestopTrainers, trainers and itensTrainers?

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Im a begginer student and im doing a MER of a project just to improve my skills with spring and mysql and while i was modeling the database i see this “loop” of table on the image.
image

I want to know if it’s a problem or if it’s wrong.

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