[libreoffice-users] Calc file size suddenly by 400x

Good evening
I do have a not so big Calc file for my personal "accounting" (keeping
track of my work)
The one from last year was about 160 kb. This year's contains naturally
less data.
And that suddenly jumped to 27 MB and file constantly crashes.

Copying the data into a new few file gives me about 78 kb.

Where does that giant data package of 27 MB suddenly come from?
Can I get rid of it?

Thank you
Thomas

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