I wouldn't worry about it. It is often commonplace that various USCIS ServiceCenters shuffle cases among each other for "efficiency" and faster adjudication purposes, especially backlogged cases. Hopefully you'll obtain a positive final resolution to your case soon.
Kindly be advised that the answer above is only general in nature cannot be construed as legal advice, given that not enough facts are known. It is your responsibility to retain a lawyer to analyze the facts specific to your particular situation in order to give you specific advice. Specific answers will require cognizance of all pertinent facts about your case. Any answers offered on Avvo are of a general nature only, and are not meant to create an attorney-client relationship.
Generally, the USCIS transferred the pending file for a further adjustment review and decision to another USCIS facility that handles these matters at that facility. Without knowing exactly how the case was prepared or knowing whether any flaws or mistakes were made it is impossible to gage the duration for its review.
Finally, any criminal history will be reviewed, including the arrest on merits. For instance, if the background check reveals an arrest and your application omitted it than will present a potential perjury issue and denial.
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Something is up and it's hard for us to know what without more information. Talk to an attorney.
This answer does not create an attorney-client relationship and is not meant to be relied upon as legal advice.