The claim that a significant drop in votes during the Nevada District 2 House race stemmed from election fraud is false because election officials and news organizations confirmed the fluctuation was caused by an entry typo by the Associated Press rather than missing ballots.
A drop of 90,000 votes in the Nevada District 2 House race was caused by election fraud.

Did 56,000 votes for a Nevada Republican congressional candidate disappear on election night? - The Nevada Independent
Source: thenevadaindependent.com
Key Evidence
Investigation by news organizations and election officials confirmed the anomaly was an Associated Press entry typo rather than missing ballots.
No actual votes were removed or manipulated during the tabulation of the Nevada District 2 contest.
What the Evidence Shows
Social media rumors suggested that a sudden numeric drop in vote totals during the Nevada congressional contest indicated fraudulent activity or stolen ballots. Subsequent investigations by independent fact-checkers and reporting from organizations such as Lead Stories established that the irregularity was a data entry mistake rather than any tampering with actual votes.leadstories.comleadstories.comFact Check: NO Evidence 90,000 Drop In Votes In Nevada District 2 House Race Was...The claim that a drop in votes in the Nevada District 2 House race was caused by "election fraud" is false During the election results reporting for Nevada’s 2nd Congressional District race between Republican David Flippo and Democrat...
Local election officials and representatives from the Associated Press verified that the temporary spike and subsequent drop resulted from a reporting typo during tabulation feeds. No physical ballots were lost, removed, or affected by fraud during the tallying process.thenevadaindependent.comthenevadaindependent.comDid 56,000 votes for a Nevada Republican congressional candidate disappear on...AP Vote-Entry Error: Representatives from the Associated Press and local election officials confirmed that the fluctuation was a vote-entry typo, not a disappearance of actual ballots No Ballots Were Removed: The Nevada Secretary of...
Independent reporting and election updates confirmed that the tabulation process proceeded normally, concluding with the official outcome of the race.ktar.comktar.comDemocrat Teresa Benitez Thompson Wins Election to U S House in Nevadas 2nd...Ultimately, the race concluded with Democrat Teresa Benitez-Thompson winning the seat