This was first brought up here:
I'm having trouble zeroing in on exactly what's happening, but something about this feels like the localhost ports are getting mixed up or are not being updated within the store.
The general steps to replicate are:
  1. Create at least two sites,
    site 1
    and
    site 2
  2. Click "Open Adminer" link for
    site 1
  3. Note what site is opened in the browser
  4. Click "Open Adminer" link for
    site 2
  5. Note what site is opened in the browser -- it should be for
    site 1
While trying to replicate, I wasn't able to get this behavior 100% of the time and in at least one instance, Mailhog was opened instead of adminer. Here's a screencast to show what I'm seeing: