@slothrop
Assumption: your numbers are not numeric values but just text that looks like numbers, and text is ignored in SUM(). Standard behaviour in all major spreadsheet applications.
To check hit Ctrl+F8 (View -> Value Highlighting) then text content is displayed black, numeric content blue and formula results green.
@slothrop that sounds very serious. Which version? Have you reported it? Would love to test it. I can report it you don't want to but can provide steps.
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