Won't stay closed on mobile

great plugin btw. I have the latest version of STB and made it to where it will show up on my mobile site. however the box will not stay hidden after a user clicks the X to close it. Is it not able to set a cookie on mobile devices or would it be another issue entirely?

you can see what’s happening here at:

https://www.wallstreetinsanity.com

thanks in advance.

https://www.ads-software.com/plugins/scroll-triggered-boxes/