Thanks for sharing the video, this explains the problem:

• Your expression pedal should only  be mapped to “manual shift”. Your video shows that it is also mapped to the heel/toe parameters, and this is incorrect.
• Set your “heel” parameters to be the shift amount you want when the pedal is at heel position.
• Set your “toe” parameter to be the shift amount you want when the pedal is at toe position.
• When you sweep the manual shift parameter, it will sweep between the heel and toe shift values.

If you are not understanding how to configure the heel/toe parameters, please let me know what sound you are trying to accomplish and I can help you further.