Welcome to the world of freebie midi's off the internet. What could be happening is the author is using a non GM synth setup. Sometimes that info is embedded in the file. It will say it's GM or not for example and what synth was used.

If a midi file was created using a non GM synth the patch numbers won't match the GM patch numbers so the pitch bend is being applied to the wrong instrument so play around with that. Maybe you think the part is a regular guitar when it was actually a pedal steel or even an analog synth or horn section. Each of those uses different levels of pitch bend.

I soon learned that you don't want to be too hasty in stripping things like that out of what is otherwise a good midi file because it's not the file, it's you and your equipment. Stripping stuff like that out can ruin a good midi so when you save it do a save as so the original is still available for when you're better at figuring this stuff out. That happened to me a couple of times when I realized what was happening with one file I remembered another one that I had changed and didn't save the original. I then searched for it again and redownloaded it and now it sounds great.

Real Band is much better for this sort of thing than Biab is. In RB there are midi filters that you assign whatever CC it is, press OK and they're all gone. You can also go into piano roll view and adjust the pitch bend graphically. Maybe you can do some of this in Biab but I've always used RB for midi's because of the linear track display. It's simply easier to see what you're doing that way.

Bob

Biab/RB latest build, Win 11 Pro, Ryzen 5 5600 G, 512 Gig SSD, 16 Gigs Ram, Steinberg UR22 MkII, Roland Sonic Cell, Kurzweil PC3, Hammond SK1, Korg PA3XPro, Garritan JABB, Hypercanvas, Sampletank 3, more.