Sorry, I miscounted – we need ten copies, not nine.
对不起,我数错了——我们需要十份复印件,不是九份。
The votes were deliberately miscounted.
选票被故意数错了。
Examples from the Corpus
miscount• I thought everyone was here, but I must have miscounted.• They claim some ballots were miscounted.• CensusBureauofficialsannounced that they miscounted the nation's official population by 5 million people.
From Longman Business Dictionary
miscountmis·count /ˌmɪsˈkaʊnt/ verb [transitiveT]
to count something wrongly
allegations that the vote was deliberately miscounted