This sounds quite similar to the problems some people are seeing with M-Audio controllers (eg Pyramid incompatible with M-Audio?).
My guess would be some low-level MIDI spec issue (borderline current on the wire or such) for both, either Pyramid being just a little too strict and/or these problematic devices sending just outside the spec. In other words, a case of real world meets specifications, one way or the other. But that’s just a guess, us folks here on the forum can’t help with hardware incompatibilities, contact Squarp directly: https://squarp.net/contact