Why is my Calc sheet formula not working?

I have a spreadsheet that I’ve been working with that has 3 columns and a very simple formula. Column C value is just the column A value plus the column B value. So for instance, in row 2, the formula in cell C is =$A2+$B2.

When I want to add another row, I copy an existing blank row that has the formula in column C but has no values in columns A or B. After I copy the row I enter values in cells A and B.

Now here’s where it gets interesting. For some reason, an erroneous behavior started: I copy the blank row, enter values in cells A and/or B, but the forumula in cell C doesn’t do anything. I confirm that there’s a formula there (if I double click on the cell it actually highlights the corresponding cells A and B showing the dependency), but the cell remains blank. If I retype the formula, then I get the correct calculated value.

Another problem became evident as well. If I have a row that I had entered some time ago that has a proper value calculated for cell C and I copy/paste the formula from that cell to another cell C, it appears to copy the formula correctly (adjusting the row numbers accordingly), but the value it calculates is still from the values in the original row! This happens even if I retype the formula in the original row.

I figure something has gotten corrupted in the file, so I went through the painstaking process of reconstructing the spreadsheet, copy/pasting the source values to the new calc file, re-entering the formulas, reformatting the cells like the original, and everything calculates as expected. I’ve abandoned the original file but left it in case I can solve this problem in case it comes up again.

Has anyone seen this behavior before? Sorry I don’t have an illustration of the cells, hoping that my description is clear. If it’s not, I can try to create some screen shots.

When you want to add another row, it might be easier to just copy any row that is already used, but then use Menu Edit → Paste Special …

In the Paste Special dialog box be sure to check only the box for Formula and un-check everything else, except maybe the box for Format in case that might be useful too.

Very Menu/Data/Calculate/Autocalculate is set, or use [F9] to do the calculations.

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Thanks. Somehow this was inadvertently turned off. Why it behaves the way it does, though, when off is quite strange, so it did not occur to me that this might be the issue.

I had thought several years of columnar calculations had vanished. Auto calculate restored my calculations. Thanks very much !