Question Hidden code?

May 14, 2021
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I've got a column of times in Google sheets which are totaled at the bottom. The code at the bottom is =Sum(F5:F41). The total is obviously wrong. If I truncate the values to F5:F16, it's correct. As soon as I go to F17, the total drops to a wrong amount.

All the rows, columns, and cells look correct, so the only thing I can think of is some embedded code within a cell that I can't see.

Any suggestions would be greatly appreciated.