Why do I have to hit "save" more than once to save a Libre Office Calc?

Lately, I have to click o “Save” more than once to save a document in Libre Office Calc. What would be causing this? I’m using Windows 10 on a Lenovo PC with 1 terabyte hard drive & 8 Mb memory. Any information would be appreciated. By the way, I’m a 79-year-old who’s not too computer savvy.

Are you sure?, sometimes one can have such impression, please test the file properties on the system.

And if you hit Ctrl+S, is it enough to do it once? Then, perhaps, the problem is about your mouse. Or your hands. No offense, but it is quite an age.