High rainfall rate, it could be an error but perhaps not
“The SFMR performance is highly reliable at hurricane-force wind speeds, but accuracy is found to degrade at weaker wind speeds, particularly in heavy precipitation. Specifically, a significant overestimation of surface wind speeds is found in these conditions, suggesting inaccurate accounting for the impact of rain on the measured microwave brightness temperature.”
https://journals.ametsoc.org/view/journals/atot/31/11/jtech-d-14-00028_1.xml