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@smwforever45
@sam-spargo
My guess on why this happens is:
This class has been very close to a rank-up, and with the 2.0 update, the rank-up requirements changed but Mastery ranks were not updated to reflect that. Instead, it shows a negative number that will be added to the class’ collected Mastery when you next play with the class and rank up by collecting at least one Mastery point.