Just for context, I have to cycle a fair way out before I can get to long straights without interruptions from junctions. This is also my first standalone cycle computer and is the first time creating and using the training plans, so the error could be user related.
On a training day, I turn on the unit and press the start button which brings up the training steps as the first screen.
I swipe up and pause the workout, cycle to my starting point, and resume the workout once I am able to ride uninterrupted.
My post ride summary has me averaging close to Mach 30 as my warmup, and Mach 121 on my 2nd bike step 
Not sure how it has come to that conclusion with my average speed and distance, because I have only travelled about 9-10km to the end of that first warmup step.
Is this user error or an actual bug? Should I only be pausing and resuming the workout when I actually stop and go respectively?