Hello kenixTrueno,
Thank you for posting in the Apple Support Communities. You're in the right spot for help with your iPhone 13 Pro Max.
It sounds like 2 third-party camera apps aren't focusing as expected. To help isolate this issue a bit further, try removing all accessories (i.e. case, film, etc.), cleaning the lenses with a microfiber cloth, and restarting your iPhone. Please reference the link below for additional information regarding these steps:
If the camera or flash on your iPhone, iPad, or iPod touch isn't working
Next, try closing the third-party apps, then opening them again. This step can refresh the apps.
Quit and reopen an app on iPhone
From there, make sure your iPhone and your apps are fully updated since fixes are included with each update. If an update is available, we suggest having a current backup to iCloud or to a computer, first.
How to back up your iPhone, iPad, and iPod touch
Update your iPhone, iPad, or iPod touch
We hope this information is useful. Kind regards.