fitness app custom plan giving random trainers

I created a custom plan and clearly selected one preferred trainer. But Fitness app keeps adding other random trainers in my plan. This issue is occurring recently. My previous plan ran for 8 weeks, every day with my preferred trainer. After finishing that plan now when I create a new plan it just annoyingly keeps giving me bad surprise every day with random unwanted trainer. This is so annoying. Repeat plan button simply doesn’t create any plan!