The ad sticks to the photo

Ad Inserter only inserts your codes according to the settings. It does not display anything.

If you don’t want to insert ads near images you can use clearance settings:
https://adinserter.pro/documentation/paragraph-settings#clearance

Can you please clarify what you mean by “stick to the photo”?

The ad fits very tightly to the photo.

https://itznaniya.ru/kak-vklyuchit-prostranstvennyj-zvuk-3d-zvuk-v-windows-10/

All the blocks are properly inserted.
Since some paragraphs are next to images the blocks get inserted there – as configured.

If you don’t want to insert them near images use paragraph clearance settings as explained.

If I use this function, then in some cases the ads are not shown at all.

The plugin only inserts ad codes, it does not display anything:
https://adinserter.pro/faq/how-ad-inserter-works