I am just changing my site's theme, now ad visibility is so low, also there is trouble with vignette ad, when I try to close the vignette ads, it brings me into GOOGLE HOMEPAGE T-T
For the vignette ad, what button are you clicking on? Can you share a screenshot?
The WP placeholders should carry over since your site is built with WordPress. However, the system may need some time to test new set-up. You can also manage ad placeholders directly with the Chrome extension.