if the GLCM bands look alright, you should be able to apply PCA to the product. Can you please visually check each of them if they contain valid data?
Also here, we should now focus in one topic - it makes sense to continue here: Sentinel-1 SNAP toolbox image view does not export as Geotiff with spatial reference - #17 by ABraun
If I had to do it, I would first geocode the data, then perform GLCM, then apply PCA.