Why is the cause of this stupid and unrealistic navlog approach to Cuzco?

 

 

Abd how to fix it?

 

thanks

Possibly the STAR (with altitude constraints)?  In other words if you have access to the charts, look at the altitude constraints on the STAR and the Approach you're using.   MSFS seems to be confused about which altitudes to use there.  Personally, I use the actual charts and either program the FMC manually (if the plane has an FMC), or use Simbrief, to avoid these problems with MSFS misinterpreting the altitudes.

Cuzco has lots of mountain restrictions as you know.  The STAR and approach from the west has a big turn to final and the STAR from the east winds thru a valley, and you really have to be on your toes when double-checking what you're putting into the FMC altitude-wise, or when double-checking the navlog.

Also, I'm not familiar with the screen in your screenshot, above, but that looks like some sort of MSFS screen I never use.