Bass and guitar are written an octave higher then they sound. Some MIDI tracks export as the raised octave while others do not. Some MIDI sound sources expect the incoming MIDI track to be an octave higher while others expect it to be the actual notes, that is not transposed up an octave. Apparently this MIDI bass track is in the original pitch and your other bass sounds do the transposing. But your Corebass Pear is in the original pitch and does not transpose.

But you can correct this in Kontakt. Load Corebass Pear, click on the upper left corner wrench then click on instrument options. In the MIDI window raise the pitch by 12, one octave, and do a batch resave I would use a different name if possible. Now when you load that resaved patch it will play just fine.

I hope this isn't too confusing and it helps.

Why is it that doctors call what they do 'practice'?
If flying is so safe, why do they call the airport, the terminal?

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware