Cells suddenly changing across sheets

Hi there! I’m not a super proficient user with spreadsheets/excel/calc but I do get by with the bare basics. I created a basic spreadsheet with calc which I’ve been using for years now without any problem. Until yesterday, when I noticed that modifying cells in the latest sheet, messes up/modifies entries in the same cells in previous sheets! I have no clue how this happened, as I didn’t use any functions or macros in my spreadsheet that link cells across sheets. Is this a glitch? Any idea how I can fix this? Any help would be appreciated as this is an important document which I use to keep track of the metrics required for my profession. Thanks!

Make sure that only one sheet tab is selected.
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