Let me take a stab. Half of them are related to global warming, right?
They should look very closely at the climate-research field, where pro-alarmist papers get special treatment and skeptic papers get un-special (i.e., negative) treatment.
This is not surprising at all. The peer review process has been broken for a long time.
I've retired from that editorial position, but I still occasionally do reviews for that same journal, and for a couple of other journals that publish papers in my field. When I'm asked to undertake a review, it's always by an editor who knows me, not by the author of the paper.
Something has gone badly wrong in the journal business. I think we have too many journals needing to fill their pages, and quality has suffered as a result. The peer review issue is a symptom of this problem.