Lots of custom fields added

Hello, when i publish new posts or update old ones, there are many custom fields added like for example: saswp_review_enable_rating_52149 (0), saswp_review_enable_rating_52296 (0), saswp_review_enable_rating_52147 (0), saswp_review_enable_rating_52133 (0)…
Is it normal? I have disabled review rating option from settings. I tried also to clear these fields from postmeta database but nothing changed.

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