Thank you for contacting Rank Math and sorry for any inconvenience that might have been caused due to that.
I have tested your site here: https://www.siteliner.com/ and it seems you have a lot of duplicate content. Google recommends that for duplicate pages, you should add a canonical URL to show the original page.
You can add the canonical URL in Rank math metabox under Advanced tab.
Canonical won’t remove the duplicate message from siteliner, it will just tell Google from where your content comes from so they don’t penalize you for duplicated content. As far as you set the canonical with the original content source, you don’t need to worry about siteliner, Google won’t penalize you for having duplicate content.