bug? Samples in MIDI tracks in Step REC mode - weird flange

greets

I get a weird flange and detune/uptune effect with one program.

The program consists of different drum samples. Cymbals, kicks, snares , etc...

I go into GRID mode, change the track type to MIDI, then press Overdub (for step entry). If I enable the note length function Q-1 button and then start hitting pads I get a weird flange type effect on the samples and if I slide the Q-1 slider up and down it detunes/uptunes the samples. When I play back the sequence the samples playback normally.

This does not happen if I turn the note length function off and enter notes according to the T.C. setting.

It also does not happen in real time overdubbing.

I've tried the same samples in a different program, everything is ok.

I wonder what the cause of this weird "bug" might be?

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using 2XL 3.24

Flanging effect usually denotes that the sample is actually plaing twice at the same time. So it might be that you have a note under that note. and the sequencer plays both notes. It happens sometimes