Re: I'm baffled
If your mobile banking application is compromised, you will find out when you receive the next statement from your bank, the details of all transactions will be there for you to see. If you dispute any of them, there is a clear process to follow, which (in exception of cases of gross negligence) will result in any losses bing refunded.
With mobile app voting, you will not get a validated statement of how you actually voted, so you will be unaware of any fraud, and have no ability to raise a dispute and have the vote corrected.