Have you Googled Training Peaks Breakthrough Workout? These are workouts that have a strong training effect. If you do not have more than 6 weeks of workouts the TP CTL model does not “know” you well yet. It assumes you started this plan with zero fitness so in the early weeks it thinks your CTL ramp rate is crazy fast and so may think you are training too hard. Within the constraints of the model it thinks you might be overdoing it. Have you set your zones correctly on TP? Either by HR or pace? TP is an incredibly powerful tool, but like any tool you have to take the time to learn how to use it. There is vast amount of tutorial content on TP and Youtube about how to make the best use of this tool. Should you decide to dive in and learn you will be rewarded with a better training experience.