CINR & SNR issue

Hello,

I have a problem with CINR and SNR data
Knowing that I did a test to pull the speed from the line and almost everything is normal!!!

What do you think the reason for these readings, which are in the pictures below
The CINR and SNR are suddenly dropped even though the Tx / MCS and Rx / MCS data are normal
Will this affect the line’s performance?

“I apologize for my English, as I am from Saudi Arabia”