scrollview scrolling when it shouldn't

I have a UIScrollView with a tall view that has a lot of controls on it. Near the bottom of the ScrollView I have a button and some text fields. When I click the button, the scroll view scrolls up a little bit, which is not what I want and I can find no code anywhere that would cause it to scroll. I set breakpoints on every line of code that scrolls the scroll view, but the program never breaks on one of them when the button is clicked. Does anyone have any idea what could be causing the scrolling?

I'd really appreciate any help, I've already pulled enough hair out over this one.

 

button code

The code that executes when the button is clicked is this:

Code:

- (IBAction)addPersonTapped {
    FFSAppDelegate *appDelegate = (FFSAppDelegate *)[[UIApplication sharedApplication] delegate];
    if (appDelegate.currentCID == nil) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Select Association" message:@"You must first select an association by tapping the 'Select Association' button at the top." delegate:self cancelButtonTitle:@"Okay" otherButtonTitles:nil];
        [alert show];
    }
    else {
        if (peopleCategoryPicker == nil) {
            self.peopleCategoryPicker = [[FFSPeopleCategories alloc] initWithStyle:UITableViewStylePlain];
            peopleCategoryPicker.delegate = self;
            self.peopleCategoryPickerPopover = [[UIPopoverController alloc] initWithContentViewController:peopleCategoryPicker]; 
        }
        [self.peopleCategoryPickerPopover presentPopoverFromRect:[txtPeopleCategories bounds] inView:txtPeopleCategories permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];    
    }

    FFSPerson *newPerson = [[FFSPerson alloc] init];
    [addedPeople addObject:newPerson];
    minPeopleSliderLabel.text = @"1";
    maxPeopleSliderLabel.text = [NSString stringWithFormat:@"%i", [addedPeople count]];
    peopleSlider.maximumValue = [addedPeople count];
    peopleSlider.value = [addedPeople count];

}

Basically, it displays a popover pointing to a textfield, then creates a new instance of a custom object, adds it to an array, sets the text on some labels, and changes some properties on a slider. Nowhere in the function does it do anything with the scrollview or call another function, that's why I'm so confused.