That forms trigger is for a specific app. Are you using that app for the form submissions? If so, you should contact that app to tell them their trigger is not working.
That’s the “Action”. The trigger is the first step in a workflow that indicates when it will begin. In this case, it looks like you are using Helium Customer Fields / Customer submitted form. It’s unclear from their description when that would trigger (possibly only if you use one of their forms). If you aren’t seeing that trigger happen, then you should check with them.