Just ran into a brutal #UI / #UX problem in LibreOffice Calc, on a Debian bookworm system, fully up to date.
1. Decide to print spreadsheet
2. Open print dialog
3. Preview is in the left pane, options in the right.
4. Scroll down in the options pane to find an option near the bottom.
5. Change setting, or not.
6. Scroll back up to the top of the options pane, using the pointing device vertical scroll wheel.
7. If the "number of copies" scrollbox happens to pass under the mouse pointer, it will rapidly increase the number of copies. It's not particularly obvious this is happening; it's easy to miss the value is changing.
8. Move the mouse pointer slightly up and scrolling the options pane continues.
9. Click "print".
Voila! 23 copies of what you wanted to print a single copy of.
I actually ran into this while trying to debug a totally different UI / UX bug