If you want to attempt to troubleshoot it, do this. Disable every plugin and see if the scrolling works as expected. If it does, then turn them on again, one by one checking as you go. Once it stops working you’ll know where the conflict is. From there you can decide if the plugin or the scrolling is more important.
The extra scrollbar appears to be coming from this style in the Themeify builder:
.animation-running, body.animation-on {
overflow-x: hidden;
}
If I take that out of the plugin’s stylesheet the scrollbar disappears. You could try adding this to the Custom CSS:
.animation-running, body.animation-on {
overflow-x: visible;
}
to remove the extra scrollbar. I don’t know if doing that will affect the plugin’s operation though.