Edward,
First of all, huge thanks for ultra fast response.
I’ll be at my first week of dealing with WP so I know absolutely nothing about it and really appreciate you pointing me in the right direction.
I’ve started by switching to a default WordPress Twenty series (there’s three of them available). I haven’t even switched, I’ve just clicked “live preview” button and all the pictures are showing exactly where they should be showing. Because of that, I assume the problem lies with the theme I’m using. It looks like I need to contact the developer. I’m surprised because I’m using a very popular theme.
I’ll update you with the outcome.