Ive got this Problem too.
But i figured out something.
If youre logged in to your WordPress account, it Shows the wrong title in head-area and the browser-window/tab.
if you start the customizer, it shows the correct one.
if youre logged off, i used private window and another browser for testing, it Shows the correct title of the sub-site.
I hope this helps for fixing…
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This reply was modified 7 years, 10 months ago by msar.