Product variant drop down menu not working

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I noticed my website is having a big problem, which is the drop down menu of all product variants are not working. Some users on Apple / Android devices are unable to click on the drop down list to select a variant (say Color, Size). 

My website is using the successtheme, but the theme developer is no longer making update on his theme already.

Anyone know how I can solve this issue?

Thanks in advance.