Thank you for your patience over the weekend.
So the issue appears to be that your permalink structure was changed when you moved from WordPress.com to your self-hosted site. So, when clicking on a specific link, the site redirect is trying to send people to a page that doesn't exist on your new site. This is probably why Pinterest is flagging stuff as suspicious, because it's a redirect that doesn't actually go anywhere.
You could change your permalink structure to match the structure you used on WordPress.com, but that might take a lot of work. You could also put in individual redirects so that the links are each pointing to the correct "new" version of the page. That would also be a lot of work, and might not ease pinterest's suspicions, but it might be less work than the permalink issue.