Contact the issuer. The w2 has boxes 15-20 on one row that should all relate to the one state listed in box 15. You may have two rows, one for each state. The employer may have made changes behind the scenes and applied the payment to MA and gotten a refund from CT. You should definitely have MA tax withheld and it should be clearly stated on the w2.
The issuer may have planned to send a second w2 with only state information that you did not receive. We can only guess at what they may have done which is why they issuer needs to be contacted to get a corrected w2 that shows the correct state and the correct state tax paid.
CT does not require a return if no state tax is withheld. Your resident state will tax everything but they will give you a credit for tax paid to CT, if you did indeed have CT tax withheld at the end of the year. Which would be the normal case.
Once you have a corrected w2, enter the information. If you need to do a CT return, do it before your MA return in order for the credit to properly calculate.
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