Hi Paul,
Some of your target paces are way off, judging by your attached image.
Your 1 mile time is set to 7 hours, 0 minutes, and 11 seconds.
Your half marathon time is 107 hours, 8 minutes, and 10 seconds.
Your half marathon time is 232 hours, 9 minutes, and 29 seconds.
If I was you I would correct these and then everything should be much better in the workouts.