Unfortunately bad phase behavior is quite common in the VC-5 applications when two OSC's is tuned equal. It's very easy to hear when two oscilators both for example is using Saw waveform and are tuned equal.
It really has to be fixed, because it means a sound that at any time is in a phase where the oscilators is in a equal tuning, the sound will sound very wrong, thin and bad.
Perhaps it happens because a internal latency somewhere in the applications is too high.