This might occur after you’ve edited a tone that uses a pattern but you haven’t saved the tone yet.
After you edit a tone that uses a pattern, either save the tone as separately from the pattern, or save both the pattern and tone.
* The sequencer only stores the tone number and position.
For details on how to save a tone, refer to “Saving a Tone/Pattern (WRITE MENU)” in the SH-4d Reference Manual.