Didn’t vote for president??

Anyone else find it odd that 19,610, or 1.3%, of Nevadans who cast their ballot “didn’t vote” for any presidential candidate??? I mean I don’t see this happening in any other states so far. Are these the people who voted but their ballot got messed up or what???

Edit: i have now learned that other states don’t have a “none of these candidates” option, so it for sure happens in other states, we just don’t have that data reported the same way