It could be a secondary mode setting. Like the modulation is set high.
Here is how to rest them:

ERASING SECONDARY KNOB SETTINGS
1. To erase the secondary knob settings of a particular mode, press and
hold the TAP/DIVIDE switch. Then, while holding TAP/DIVIDE, press
and hold the footswitch for 2 seconds. The LED will blink quickly
indicating that the secondary knob settings of the current mode have
been reset to the default factory settings.
2. To erase the secondary knob settings of every mode and restore them
all to factory defaults, first unplug the CANYON from power. Press and
hold the TAP/DIVIDE switch. Then, while holding TAP/DIVIDE, plug
power back in to the CANYON. The LED will blink quickly, indicating
that all secondary knob functions have been restored to the factory
default.
3. To erase the secondary knob settings of every mode and reset the
internal footswitch’s tap tempo to the factory default, first unplug the
CANYON from power. Press and hold both the TAP/DIVIDE switch and
the footswitch. Then, while holding both switches, plug power back in
to the CANYON. The LED will cycle through red, orange and green to
indicate that the CANYON has been restored to factory default
secondary knob settings and tap tempo settings.