Hi,
The issue is not related to the results count, but the parallax overflow. Also, there is a different custom CSS applied there in the custom.css file, that overrides this one:
[html]/* Added March 2018: eschmid | Reason: navigation on internal pages being hidden by blue screened image on the page; z-index for this id had been set to 999 */
#av_section_1 {
z-index: 1;
}[/html]
That is not a big issue, but the overflow is. The parallax type background changes the overlow property of the av_section_1 element (that contains the search and the drop-down) to ‘hidden’. I guess that is required for the parallax to work properly. However this causes an unsolvable problem, as nothing can ‘escape’ this element boundaries. Hidden overflow means, that “The overflow is clipped, and the rest of the content will be invisible”. And since the search and the drop-down are inside of this element, it is not possible for them in any way to pop over it.
This time, it is not actually the results container hovering over the drop-down, but it is actually cut off by it’s parent element. Unfortunately there is no way to get around it, as this is a CSS specification. I guess turning off the parallax effect will revert back the overflow to the original value as well.