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However, exporting works fine for my bass guitar, guitar and drums, but the piano is just... out of tune... when I import that.
Can you please go through the exact steps that you use to export (click this, select that, etc). As much detail as possible is preferable.
And also the exact steps you use to import - which tools you use, click this, open that, select this etc?

What version of BIAB (and Build) are you using?

Were the Guitars and Drums exported at a different session than the Piano? Were any audio settings changed in between the sessions?

Exactly which piano RealTrack are you using?

As much detail as possible always assists remote diagnosis.

BIAB & RB2025 Win.(Audiophile), Sonar Platinum, Cakewalk by Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Kontakt, Focusrite 18i20, KetronSD2, NS40M Monitors, Pioneer Active Monitors, AKG K271 Studio H'phones