Cambridge was forced to walk back the preliminary results of last week’s School Committee race after the vendor overseeing the city’s election system failed to clear more than 2,000 test ballots.

Released hours after the polls closed, the unofficial results included 1,370 extra votes for the School Committee, 632 for the City Council, and 156 for a ballot question, city officials said in a later statement .

“The Cambridge Election Commission conducts rigorous and mandatory prequalified testing for every election,” the city explained, adding that a “proactive auditing process” determined the test ballots hadn’t fully been cleared from the system before the polls opened.

When election officials crunched the numbers again, only the School Committee race saw a shakeup; instead of newco

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