I don’t think any part of that structure is level?
They say use the right tools for the job, but if you don’t use them properly they are not very effective. They say computers don’t make mistakes, only the user. But the manufacturer might’ve made a mistake? The software might be corrupt? But it’s more likely something you did?
At the end of the day, if it’s at all possible, a second opinion might help, or someone who can see it from a different perspective and spot the mistake.
How many, have struggled putting flat pack furniture together? You’re almost done and then you realize you put the tracks on upside down, or just missed a step and now you can’t get the doors on and have to pull it all apart again? Nothing to do with trying to make a deck level, but oh so annoying!