If any returns shall appear to be irregular or false so that the Elections Canvassing Commission is unable to determine the true vote for any office, nomination, constitutional amendment, or other measure presented to the electors, the commission shall so certify and shall not include the returns in its determination, canvass, and declaration. The Elections Canvassing Commission in determining the true vote shall not have authority to look beyond the county returns. The Department of State shall file in its office all the returns, together with other documents and papers received by it or the commission. The commission shall canvass the returns for presidential electors and representatives to Congress separately from their canvass of returns for state officers.