The return should have shown $18K SEP IRA contribution and $6K conversion but it looks like you did not enter it correctly since you are only seeing a $12K contribution. So to the IRS it shows only the $12K to the sep and nothing for the ROTH contribution as they are not reported on the return. All in all the same bottom line is achieved unless you were not allowed to make a ROTH contribution due to income limitations. If that is the case you may want to amend the return ... review the form 5498 for the SEP & ROTH to see what got reported to the IRS.
