So I contacted support and the answer is yes and it caused a bug:
“I have taken a look at your calendar and noticed what has happened here. We recently changed something in our backend settings that caused the Anaerobic workouts to change. This only affects Planned Activities in future phases. So the workouts would eventually get adapted correctly but would look wrong up until the athlete reaches that phase. This being said, I went into your account and switched things back to how they were original.”