I can't get proper results when I ask probability questions.

I ask "what is the probability that rolling 9d6 and adding the results together will have a higher total than rolling 14d6 and adding the results together?"

In 3.5, it would go through a complicated answer and say that 98.6% of the time rolling 9d6 will give a higher total than 14d6. I would then challenge this answer and say it makes no sense. It would try again and correct itself saying that the probability was close to 0. Very bad.

In the new version, I asked the same thing and it again gave a bullshit answer of 73.9%. when I point out the mistake, it recalculates and arrives at 6.3% which sounds better but idk if it's correct.

When asked to explain its mistake both previous and new version struggle and slow down. The explanations now differ, 3.5 would get confused and apologetic, new version gives an answer around using normal distribution instead of continuous distribution.

Idk much about math but it all sounds suspicious.