Unknown Modulation on Pitch?

I’m new to using the Shruthi - I have a SMR4 mkII Filter Board.
I made a group of new patches but there is an unknown modulation i can’t seem to get rid of.
When you press the same key on the keyboard the pitch of the note changes.
I’ve been trying to work out what this is and have looked at the modulation settings + Arpeggiator and Sequencer but I can’t get it to stop.
Any ideas ?

Check in the modulation matrix?

Well I did - but I’ll have another look , maybe it’s the sequencer playing different notes ?
I havn’t really understood how that works yet.