My coder checked and found out that there is an error with .js on your site. And this error belongs to plugin "Quantities and Units for WooCommerce"
So, you can contact to the author of this plugin to get support http://prntscr.com/luq7wj
Hope that you can understand for this
By: yame a day ago
Dec 14, 2018 at 02:06
We offer service for $29. If you would like to use it, please click here to provide your credential information.
Use our expert service to turn your ideas into reality. Click here to provide your needed information.
Our support service works from Monday to Friday.
Mean time (GMT +7):
+ 7:30 - 11:30 AM + 1:30 - 5:30 PM
We will try to answer all the questions within 24 hours and solve them as quickly as possible