Strange pattern over snow region post radiometric terrain correction

Hello,
I was processing some data over snow-covered glaciers and I observed that the snow region in one of the images had patterns. I followed the processing steps given in the S1TBX Synergetic use of S1 (SAR) and S2 (optical) data Tutorial.pdf The first is a processed image from October 2021 and the second image is the one with the strange pattern over the same region in May 2021. I am wondering is the unusual pattern reasonable.
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