Some parts on my iPhone's wallpaper are blurred

Open Settings App

Tap Wallpaper

Tap the Wallpaper on the right

Look for Blur on the bottom right hand side of the screen and tap it to turn Blur off

I have no clue what's causing that. I'd contact Apple Support for help.

I had no idea that people spent this much time looking at their wallpaper.

cbsoybas wrote:

It is my phone I can do what I want

You absolutely can. I never said otherwise.