Journal Opencart - Simple Question for add products

Hello to everyone. I have a simple question.
Journal Opencart theme, when I add products in theme 3 (please see image below).
The add button stays stuck. Cannot add again from the same product without refreshing the page. What could be the reason for this error?
Please help, I couldn’t figure this out.

Link: Rivasol


Contact with your purchase item author @DigitalAtelier right here as a comments

Hope they will helepd!