Been having this issue a bit lately (or maybe it;s juts the styles I am choosing?) Anyway,in this case style is _MISTYNYC which in the style picker has a guitar track and a different drum kit to the default style that appears when BIAB loads.

It seems it cannot get away from loading this default setup of a bass piano and the same drum kit.

So is my BIAB developing some sort of bug or are there bugs in the styles?