Initial processing, two blocs problem

Hello dear community!
Please, I have a problem with the processing of drone missions. Indeed, when the first stage of processing is completed, I find that my project is divided into two blocks with respect to the z component.
What is the source of this problem and how can I solve it?

Yours sincerely !

Hello,

Would you please upload the quality report? I would also like to know if there are images from different flights added to process it.