Odd auto re-sign-in on windows 11

hi,
i'm trying to work something out, on my current install of windows 11 (24h2), though i have it to sign-in automatically (no password) local account.
if i click sign-out it automatically signs back in.
where on another machine sign-out stays on the sign-in screen ready to sign-in again. (signs in automatically on a restart or cold boot.)
i guess i've changed something in the registry but i've compared the winlogon key in the registry with a virtual machine and the other physical machine and all the settings are the same.

any ideas? hope that makes se