Microsoft Forms NPS question Record -1

Hi!

I have a form with a NPS question. My question form has been created and has been running since September 1 2021. But since December 13, 2022, the answer -1 (negative 1) is periodically recorded in the answers. I don't know the reason and how to fix it. Answered with a choice of all available options in turn (0-10, do not answer (made the question optional)) - the entries are correct. I didn’t change the form for a very long time, I don’t understand how when choosing 0-10, negative 1 is written. And it happened in different forms

Problem happens when you reply from a mobile device

https://drive.google.com/file/d/1sy8s1B0qOc5rPDTxThPl_WLp1jiUEf3V/view?usp=sharing 

problem - customer responses

My test at Desktop