Invoice Approval going past the required approver

User A (has level 1 approval authority) has always been able to approve invoices up to $25,000.  It doesn't need to go up the next higher level to User B. As far as User A, nothing has changed in his employee, job or approval setup (except the supervisor). The Invoice Approval Workflow setup has not changed as well (only requires a level 1 approval authority).  This has been working fine until someone up his chain left the company.

User A (level 1) used to report to User B (level 3). User B left the company.  User A now reports to User C (level 1).

Now for any invoice less than or equal to $25,000, User A's approval is not enough.  After User A has approved, it now goes up to User C for approval.