Maybe this is known and I missed it, but try this:
Enter Scale Setup
Open Tempo
Hold Function while turning Level to change tempo
Exit Tempo and Scale
Press play. Your sequence should play at the original tempo.
Press Function again. The tempo should jump to the new tempo.
I think it is due to locked situation of the FUNCT button (like if it was pressed).
Because, actually, the FUNCT+LEV while in TEMPO screen, lets you adjust the tempo without actually affecting the internal clock and seq, till you release FUNCt > then it jumps directly to the new Bpm value
So sounds like the Function key gets ‘stuck’ while in Scale Setup mode…
Wonder if that bug could be exploited to allow one finger mutes via the track buttons while the trig keys are busy doing other things… Might be useful in some situations.