Hi aallppeevvaa96 ,
I'm sorry but I don't think I could help you that much with this issue.
It seems like your site is just, overall, loading the scripts very late.
This is not only affecting Buttonizer but also other functions such as the image carousel on the homepage.
It could be a plugin that's doing this, a setting or perhaps a custom function in the PHP.
But yeah, I can't really help you out that much trying to find out what's causing this.
Maybe try using a caching plugin such as WP-Rocket or Autoptimize.