Ad above Header on Issue

check in the header.php file of your theme to see if the linked image representing the ad on top of your site is hard-coded in the header.php file.

is this the link to your theme? https://themeforest.net/item/the-issue-versatile-magazine-theme/23448818 — if yes, the you could also ask the theme’s author for suggestions.

(volunteers on this forum do not have access to files from theme’s purchased on themeforest.)