I am not a virologist so I can't explain why, though I have my own opinion.
Here is the link to the Walgreens Covid Tracker. It is constantly updated and is now showing 4/26/2022 - 5/2/2022
https://www.walgreens.com/businesssolutions/covid-19-index.jsp
Page 3 of the index is still showing the vaxed has higher positivity (15.4% vs. 84.6%) even as the infection rate is climbing.
Unfortunately, other trackers like John Hopkins, Mayo Clinic, and the CDC have stopped reporting rates by vax status.
I did find a Wisconsin tracker which shows fully vaxed at a lower positivity rate. However, they only count those with 2 shots and a booster as vaxed. Everyone else is counted as unvaxxed. They also don't consider an infected person vaxed if their last booster shot was <2 weeks ago.