I was arrested, but not convicted. I got my arrest expunged about a year ago.
Will it still show up in a background check? Is there any way to fix it if it does?
See the answer to this question. It is remotely possible that it will show up, but the new S.C. law also says that an employer cannot use that information. On the other hand, that law is not yet effective (it becomes effective Dec. 27 2018), so for the rest of the year, the information could be used, if an employer obtains is. There is a law-enforcement exception that arrests can always be used against you if you apply for a law-enforcement related job.
Under the current law (has been in effect for a while), the record is "under seal", so revealing the record in the course of a background check would be a violation of the relevant court order. The law specifies a punishment for illegal disclosure:
A person who intentionally violates this subsection is guilty of a misdemeanor, and, upon conviction, must be fined not more than one hundred dollars or imprisoned not more than thirty days, or both.
however, accidental disclosure is not a crime. You might think that you could at least sue them for accidental disclosure, but the law also says
Unless there is an act of gross negligence or intentional misconduct, nothing in this section gives rise to a claim for damages against the State, a state employee, a political subdivision of the State, an employee of a political subdivision of the State, a public officer, or other persons.
If the government person who releases the information intentionally does so, you can sue. Perhaps an accidental release could be found to be grossly negligent: that would depend on the circumstances.