The season started... Pats1 is playing through the 2021 Season. You had too many people on your roster so they were trimmed down. If you read this thread you just commented on, it's pretty self explanatory.
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I'll have to defer to cdcox on your second question, but I think pats1 is a new league so they're not on the same schedule as other leagues. So that's probably the issue.
Yes, Pats1 is going to simulate the 2021 season. There was an email that went out giving several days to make your own roster cuts.