It sounds like you've been bit by one of the bugs that m:Community Wishlist Survey 2022/Miscellaneous/Automatically log in to all projects if you are logged in to one is meant to address.
User talk:Doug Weller/Flow
@Whatamidoing (WMF): thanks for alerting me to this. Doug Weller (talk) 06:47, 9 February 2022 (UTC)
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