overlapping buttons

http://yuehuahe.net
Hello, this is my website. for some reason, on ipads and iphones, the first button that shows up on the page that sends you to different sections is overlapping with the other sections. i was wondering if you could take a look and tell me how to fix this. Thank you

Could you mark on this screenshot which button you mean? screenshot

I see button only on Image Show module but there is only one button.

I'm sorry, what i mean is that there is only one button that sends you to different sections of the website, but every few seconds that button changes to a different section. Here, in the screenshot you can see that the buttons are overlapping when they are not suppose to.

secure.jpg

Ok but where I can see this buttons on front-end? I've checked carefully all your slides and everyone contain only one button.

overlapping buttons, Only on the iPad and iPhone, desktops normal.

But I don't see nowhere even two buttons - which slide contains this buttons? Could you at least change background for this slide - when all are exactly the same I have no idea where I should look for this problem.