3.0 for Helix Floor, Helix Rack, Helix LT, Helix Native, HX Effects, HX Stomp, and HX Edit is now available.
Any chance your global settings --> 'EXP Pedals' --> 'EXP 2 Pedal Position' parameter setting has changed since you updated? Depending on how you had it set before the update it can cause unpredictable volume changes afterwards from one preset/snapshot to the other if it is not the same.