Pace Range Wrong?

I was following a Runna workout today (never had a problem before, or seen this) where the pace zone was 7:05-7:45 for instance. I was within zone but it kept showing 8:20 at the alert for instance and saying ‘too fast’ which clearly I wasn’t…is this an issue with the recent update? Or just that workout from Runna? Like I say, never had a problem for 13 weeks prior