Hello there,
in breadcrumbs.php file on line 18 we rename Portfolio word to Destination word.
When you click on your single portfolio on that black Destination word it opens regular portfolio page and we think that now all works fine.
We suggest you to reduce your images on portfolio, your site will be working much fester then :)
For “Search Astir…”
please open your header_search_default.php file in partials folder
(you can find it here \wp-content\themes\astir\partials\header_search_default.php)
and on line 3 find “Search Astir…” text and rename it.
Cheers :)