Yeah, try to reproduce band 1 in band 9, and set band 1 to zero..That'd be a really obscure bug if that is indeed the issue.

One other thing I've noticed is that you have 2 bands with low Q factors and a high -ve gain. These bands will be knocking a huge chunk out of your sound...and maybe your listening volume with your eq active is pushing the DSP into clipping. But you haven't stated what your typical listening volume is, and I still wouldn't expect it to even contemplate clipping below 0dB, and if you did the flat eq test at that same volume then I'd expect it to still clip.