Hi,
It looks like the overlay might be flowing into the content. Try add this css too:
[html].rpp_item .rpp_inner {
position: relative !important;
}[/html]
It will make sure the overlay stays within the items.
It didn’t show posts on one page and portfolios on others, because the portfolio category was selected for matching – and posts does not have portfolio categories. And it didn’t show portfolio pages on posts because categories and tags doesn’t exist for portfolios. They all have different taxonomies.
I have disabled matching taxonomies, and now I can see mixed results for both posts and portfolios.