Hi I hope this helps. I had a similar thing happen and its a glitch. It happened after loading presets for me. What i did was if you go to global settings top left menu, tap switches and pedals. At the bottom the 4th icon from the left says” stomp A fs6 (model 1). Just rotate the knob to select any other switch setting and then rotate it back to where it was, and they all re-appeared for me. Give it a try it may work for you. It resolved the issue for me.
Regerds
Will.