I had electrum, installed it on Windows 7, I can't say exactly what version of the wallet it was, I don't remember. As for bias, I asked gpt chat to analyze all my signatures from the blockchain
AFAIK Electrum software never had any issues with its RNG to generate any kind of bias when it created signatures even in the older versions (I've used it since 1.9.
. And considering you say an AI found bias, it is another reason to be skeptical about existence of an actual bias in the signatures...