My guess is it's some behaviour based on autofill. That would explain why it happens for some people but not others.
The browser has been told to remember a specific entry for a text box with that name, and so it comes up with the keyboard automatically.
Interesting! Just tried disabling autofill passwords on my iPhone and it seems to have fixed the issue.
Having watched all this unfold has been great, but I would like to say this was a really inspired first step.
@Greenbank started
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My guess is it's some behaviour based on autofill. That would explain why it happens for some people but not others.
The browser has been told to remember a specific entry for a text box with that name, and so it comes up with the keyboard automatically.