Why might the most recent entry in History not match the data shown in a module?

We have a module whose data is populated from a CSV. We import the CSV to a numbered list, and then import the numbered list to the module.


We can see non-zero data in the module, but when we show the history for a populated cell, the data values in the cell are zero. Why might this be?





Strangely, the row below, which is loaded to the model the same way, behaves the way I would expect:



So the question is, based on the first example: if I have non-zero data in a cell, why would History showing me a zero value?