I posted about this yesterday if you want to read it. The short version is no, LE does not have the authority to lock down public court records. Sealing a public court record requires a court order with specific legal findings required by law as to the reasons for sealing the record. Most of the time, individual documents are sealed, not the entire case. What you normally see is that the case is listed online with the docket history, notes on which pleadings are sealed, and the actual motion and court order on sealing those documents.
The appellate record from an appeal in the case is still available online, but the county record of the entire case is gone. This means that the action was taken at the county court clerk level.
I do not believe server issues are at play. The way this happened is entirely abnormal for Oklahoma court records.