I want to warn you: try this at your own risk, for me it worked (in DNN 4.4.0).
Get the id of the page.
Login as host
Pick Host > SQL
In the box copy this:
UPDATE Tabs SET PageHeadText = NULL WHERE TabID = X
Where X is the id of the page.
Click the "Execute" link

Then clear the DNN cache:
Host > Host Settings > Advanced settings > Performance Settings > [Clear Cache]
Hope this helps

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U Da Man! It works! Thanx