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Those balance dates should correspond with the last time the account was updated. Look at the date updated or the DoLA and see if they match.
Because they can is all I can say. Some CAs are just like that.
If the debt has been paid, and their last reporting shows $0, inaccuracies in prior reporting would not be a basis for dispute.
Even if prior reporting is shown to have been inaccurate, a furnisher always has the option in any dispute to simply correct a prior inaccuracy.
If they have already done so, there is no current inaccuracy.