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Yes, based on what the OP said it seems these federal student loans were transferred to a different servicer. If that's the case these accounts will not fall off until (I think) 10 years after the loan has been paid in full. Note: a loan being transferred to a different servicer is different than a loan being paid and refinanced.
It sounds like these loans staying on OP's report isn't a bad thing. The lates may fall off earlier than the accounts do.
The Higher Education Act both requires the reporting of delinquencies on certain federal student loans, and exempts them from the normal credit report exclusion provisions of the FCRA until the loan is paid.
If the federal student loan is subject to mandatory reporting and is exempted from the exclusion provisions of the FCRA, then delinquencies will not be removed at their normal date of 7 or 7 years plus 180 days from initial delinquency, which also means they are not subject to any early exclusion.