That is false, and also ridiculously absurd. Here's why: In all of the key swing states, there is a paper ballot and a machine count. The machine counts are validated by hand counts of the paper ballots.
So, when I vote, here's the process:
1) I fill out my ballot with a pen.
2) I scan my own ballot through a voting machine
3) The machine spits out the ballot I just filled out and I drop it into a plastic box.
4) Election volunteers from both parties, plus neutral witnesses, plus international monitors watch every step.
5) Machines count the votes.
6) human beings count the paper ballots to validate the machine counts.
^^^So as you can see, there is no such thing as an instance where the machines can be manipulated to changing the result. If that ever happened, the paper ballots would expose that immediately.
So here's what's really happening here: You are being duped.