Looks like there was a rank reset with the CU29 update, and Halo slipped something into the sauce. Death counterfactuals are making an incredibly flat skill curve for all levels. As a result, PSR-D (and thus, PSR) values are super out of whack. I checked, the call isn't coming from our house: the API values are being correctly processed, its just that they're getting delivered to us in a broken state. Look for a Halo fix in the new few days, I'd guess.

UPDATE: In an attempt to make PSR usable, I've temporarily removed PSR-D from the calculation across the site.