Multiple State tax calculation issue

Moved from Maryland to Missouri at the start of December. Was a full year resident in MD for several years and never an issue. I received two W2s from my company due to the move (odd but ok); one for just Maryland with the full details populated and one for Missouri with ONLY the state wages/tax, identifiable information and my retirement plan but no data in the federal wage/tax section. I tried both combining into a single entry on the form and adding a second and received the same results - that I owe Missouri almost $6000 with only $10310 in wages for that month. This is an obscene tax rate and according to IRS, I should be taxed at 5.40% for MO and 5% for MD. 

 

I struggle to believe that my tax rate for MO is at the near 60% that it is claiming it to be. Anyone encounter this or should I contact my payroll dept since the W2 is completely blank on the federal section? Want to avoid the added expense of a tax company if possible but not opposed if needed.