Given the file size they are certainly 8-bit as has been suggested. I use this camera and every file is 17,677kb (from APT.)
That said, I was able it integrate a usable result from the two light frames you provided here in APP. The limitations of the 8-bit files are evident, but it's a much better result than PixInsight gave you. Attached is a quick screencap at 100% from integrating the two files you provided. When you look at the debayered files seperately in APP, they look essentially the same.
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