Hey there,
It seems that we are able to replicate it and confirm it is a bug.
The gaps occur that you mentioned, actually it is not a gap and is called the picture placeholder.
The reason that it occurs is because you published the post before it finished uploading the pictures. By right, the system should not allow users to publish the post when it hasn't finished upload pictures.
For your case, I believe there are 2 pictures didn't upload finished in
https://davidmihalka.com/en/habits. That is why it just render 2 placeholders only.
For a temporary solution, I suggest you re-upload the pictures and make sure the system is 100% finish upload the pictures than publish it.
I will log this into our issue tracker.