Here's what CS shared with me:
"I wanted to send you I'm here to provide you with an update regarding the rating you see.
Please bear in mind that your rating changes are part of a test that we are conducting, which applies to all sellers on our platform.
We're adjusting the rating system to accurately reflect performance, easing the pressure of aiming for a perfect 5-star rating. Research shows ratings between 4.0 and 4.9 are actually more trustworthy.
We're conducting these tests while ensuring fairness across the marketplace. The test will only be on the buyer's side, and not all buyers will be exposed to it. If buyers are included in the test, they will witness the new calculation for all sellers on the platform.
Scores will consider ratings from the last 2 years and incorporate historical private ratings, to present a more realistic view of your service. This adjustment may result in some freelancers seeing a decrease in their public rating scores."