[libreoffice-users] default style changed

Good morning
LibreOffice 4.24.2 Windows XP

I DID made quit some efforts to set up my personal default style to be
applied when opening new documents.

Today I noticed, that this "default" style has changed, on two different
computers!!, without me specifying anything.
I noticed, but this morning the document I was working on suddenly
looked VERY strange.

Where does this come from?
Is there anything to revert it, or at least prevent it from occuring again?

Thank you.

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