Custom User Field auto-filled on creation?

I created my first Custom User Field (text, see screenshot) but somehow it got auto-filled to “No”… Why does that happen, and how can create a field without it being assigned a value? Until users fill them out I would much rather it be blank (as “No” doesn’t even makes sense in this case).

Do you mean that your browser auto-filled the text field with “No”? If so, maybe looks at your browser’s auto-fill configuration?

No, it didn’t, I even impersonated another user to make sure, and sure enough when I went into their profile preferences, it said “No”… Here is a screenshot, I just logged in as another user and didn’t even click on the field and it was already populated.

And here are the original field settings when I created it.