One experience I had (coming from an Austrian right wing province) is that a significant share of polled people will not reveal to the pollster they are voting for the xenophobic candidate, because they don't want to be seen as a bigot.

It is like when your doctor is asking you if you eat fast food — some people will downplay it because they know it is wrong, but do it anyways in a "weak" moment when nobody is looking.

So suddenly in my village where I know everybody 56% voted for the right wing candidate, yet everybody¹ claimed not to do that when asked before or after.

¹: except one or two open Nazis