Sound bug

[asdfgbg]

Has anyone noticed this issue too ?
Sometimes I get a srange sound bug while entering my passcode.
The first number, I click on, seems louder than the other three.
I believe it happened after I used Siri and I didnt find a solution for this but restarting it.

 

[makerleone]

Which device you have ?

 

[asdfgbg]

Which device you have ?

iPhone 5S with iOS7

 

[makerleone]

iPhone 5S with iOS7

I also have iPhone 5s till 7 months but i really didn't found any kind of issue, its works perfectly, but i think your problem is not a major problem but if the sound is irritating you so contact your nearest apple care.