Can't think of a good reason for a journal to obtain reviews from 7 different reviewers and then issue a 3rd R&R on a paper. Accept it, reject it: either way, make a decision.

For most papers in social sciences, the pool of true area experts who aren't coauthors or have a CoI is not large. By Round 3 (original + 2 R&Rs), pool is likely tapped out. The editors will have as much, or nearly as much, expertise as reviewers 8 and 9.

Not going to name journal, but it's not sociology.