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When both oscillators are set to full rang (All octave lights on), it is expected that they may tune slightly differently from each other.

In range 8/16/32 the tune pots have ~+/-1 octave range - in "full range" mode the tune pots have ~+/-11 octave range meaning there is 22 octaves of full sweep.

There is simply not enough fine control on the pots to get both oscs in tune in this mode. The intended use for this was to use the OSC output as a mod source for something else as you are able to adjust the frequencies outside of the audio range.