HALIon playback detuned - whole step higher than written?

Dorico 4 - M1 Mac. Tried restarting, in the same project, nothing changed. All instruments play a whole step (ish) higher than written. I’m working with a piano to sketch ideas out, and it’s very confusing.

Check sample rate? Should be 48k

Yeah that’s it. Why are different sample rates for a specific library even an option if only one of them works properly?