Hi and welcome to Just Answer!
I assume that you are using H&R Block software - correct?
Thus - you provided some information that made it to "believe" you are a resident of Maine.
However - you did not mention which exactly information you entered about Maine.
If you are a Maine resident for the entire tax year, you must pay Maine tax on all of your taxable income regardless of its sources - wages, investment income, interest income, pension, and dividends among other things.
Please see for reference - http://www.maine.gov/revenue/incomeestate/guidance/res_pamphlet.pdf
I extracted some places that are related to your situation.
A "resident" taxpayer is a person who is:
-- domiciled in Maine (a "permanent legal resident"), or
-- a statutory resident.
Even if you are domiciled in another state, you may still be taxed as a Maine resident if you are a "statutory resident." You are a statutory resident if:
1. you spent more than 183 days in Maine during the tax year (any portion of a day
is counted as a full day), and
2. you maintained a permanent place of abode in Maine for the entire tax year.
Q. Each year, I live in Maine for five months and in another state for seven months. Does this mean I am not a Maine resident?
A. Not necessarily. If you were domiciled in Maine before you began spending time in the other state, you continue to be a full-year Maine resident unless, or until, you have taken steps to establish domicile in the other state or country.
What might be steps to establish domicile in Dominican Republic?
-- get residency status
-- apply a valid Dominican driver's license
-- pay income tax on worldwide income from investments abroad after the third year of residency
-- register your vehicles
-- keep active bank accounts