Starting second UIView animation undoes previous animation - ios

Question

In Swift I'm using UIView.animateWithDuration to animate a button and some text out of the frame. In the "completion" block, I perform a func called showQuestion which is another UIView animation. However, the first time the showQuestion function runs, the button and text that was previously hidden by the prior animation appears back in the frame, as if it had never moved.
I've checked a few questions on here, and none seem to directly address the issue.
EDIT #1
Here are the three functions.
func startQuiz(){
UIView.animateWithDuration(0.2, delay: 0.2, options: .CurveEaseIn, animations: {
self.goButton.frame.origin.y = self.view.frame.height + 5
self.languageLabel.frame.origin.y = self.view.frame.height + 5
self.label.frame.origin.y = self.view.frame.height + 5
}, completion: { finished in
self.generateFirstQuestion()
})
}
func generateFirstQuestion() {
var aBase = 0;
var qBase = 0;
if(self.lang == "fr") {
aBase = 25
qBase = 5
}
var offset = (self.currentQuestion * 5) + aBase
var question:String = self.questions[self.currentQuestion+qBase]
self.questionLabel.text = question
var answer1:String = self.answers[offset]
var answer2:String = self.answers[offset+1]
var answer3:String = self.answers[offset+2]
var answer4:String = self.answers[offset+3]
var answer5:String = self.answers[offset+4]
self.showQuestion()
}
func showQuestion(){
if(self.isAnimating){
UIView.animateWithDuration(0.2, delay: 0.2, options: .CurveEaseOut, animations: {
self.questionLabel.center.x = self.view.center.x
}, completion: { finished in
self.isAnimating = false
self.currentQuestion++
})
}
else {
var aBase = 0;
var qBase = 0;
if(self.lang == "fr") {
aBase = 25
qBase = 5
}
var offset = (self.currentQuestion * 5) + aBase
var question:String = self.questions[self.currentQuestion+qBase]
self.questionLabel.text = question
var answer1:String = self.answers[offset]
var answer2:String = self.answers[offset+1]
var answer3:String = self.answers[offset+2]
var answer4:String = self.answers[offset+3]
var answer5:String = self.answers[offset+4]
UIView.animateWithDuration(0.2, delay: 0.2, options: .CurveEaseIn, animations: {
self.questionLabel.frame.origin.x = 0-700
}, completion: { finished in
self.questionLabel.frame.origin.x = self.view.frame.width+5
self.isAnimating = true
self.showQuestion()
})
}
}