The stomp wah when added does not make a wah sound unless the parameters are adjusted properly. This has been the case for several years. (Unless they have changed something in recent releases). If you want a wah sound and are not proficient with making the adjustments yourself, load a wah preset (use browse knob instead of type knob). Look for a post from Monkey_Man in this forum regarding many popular wah pedal presets.
Edit: Kemper Wah Settings