ssd1306. Message is wrong, offset from preset we're on.

[NoSloppy]

next and prev preset is showing the MESSAGE from the last preset we were on.
It's directional, as in for example
Doing next preset,
Preset 3 -> Preset 4 = Preset 3's message shows
Preset 4 -> Preset 5 = Preset 4's message shows.

When doing prev preset, it's the other lagging direction:
Preset 5 -> Preset 4 = Preset 5's message
Preset 4 -> Preset 3 = Preset 4's message.

[profezzorn]

Should be fixed now.