Thanks Fernando.
So per Ying instructions I uninstalled the GP theme, and then reinstalled it.
Can you or her please check if the weird piece of CSS from the GP theme’s CSS she mentioned is now gone?
I just found a weird piece of CSS on your site which is causing the issue:
https://www.screencast.com/t/zFlXlGvSY3hC
It’s the CSS from GP theme, but the original CSS doesn’t have the space between the widget and :last-child.
I found a workaround of the scroll bar problem caused while the CSS provided was active: I used the FILTER EVERYTHING plugin settings to set the empty terms not to display, and setting the max height area to 1500 pixels.