"heart rate too low" warning

I'm trying to get back into shape and doing a 12 week 5k training plan. The plan has me running in zone 2, but warns me that my heart rate is too low regardless of my heart rate. I'll be pushing 180 bpm and it'll tell me that I'm too low (when I'm actually too high)

I checked the plan details out on the connect website and it's properly set to zone 2. I would think that means its an issue with the software on the watch?