It's the a button on the mouse. If pressed it toggles from 1 - 0,-,+ to number pad numbers to 1-6.
You can change it via the Logitech software. I set it so when I'm in mode 1-0,-,+ to green and 1-6 to red and number pad to white.
So if I'm like wtf. I can look down and the colors tell me I'm in the wrong mode.
Not sure if you can disable the button. But its easy to click back to it working normal. And use color to identify the issue quick
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