Maryland Taxes - Moved to Florida

In June, we moved from Maryland to Florida.  I have interest, dividends, and a Coast Guard reserve Retirement.  Before we moved, I had $200 withheld from my retirement check for Maryland State Taxes.  When I do my Maryland Taxes with TurboTax, it says I owe Maryland $478, but gives me the $200 credit for taxes withheld on the 1099 form.  Since we moved in June, we were not in Maryland for half the year.  I didn't think I needed to file any return to Maryland except that I want my $200 back.  And being here in Florida full time now, we don't need to file in Florida.