Defective INSTA360 EVO ??

Hi everyone.
I upload a photo to have your opinion. I have an INSTA360 EVO and I always find a blurry part in my photos. The lens are perfectly clean, always with isopropylic alcohol and lens paper, no scratches. The camera has never fallen, it has always been treated with perfect respect.
In this photo you should watch the grass. In the middle there is the stitching line. The right part is OK, the left part, taken with the other lens, is blurry.
What do you think about that ?
Other EVO owners have similar problems ???

Download the photo here, and load it in Photoshop (or other) in flat mode, zoom 100% for better check:

https://drive.google.com/file/d/1XAv3baWcvxkBjZZxrl-Jo59u7xoaWcFx/view?usp=sharing