Getting a formula to update output in dynamic fashion

I am a user of Excel at a not basic but not very advanced level.

I am wanting to apply the formulas "SUM" and "COUNT" to a range of (a few hundred) lines of financial data. The data within the range are updated daily. In the past when I have set up this kind of worksheet, with the same two formulas, the outputs (Sum and Count) were updated by Excel in dynamic fashion, as content on each line was updated. Now, in order to get the updated output, I have to place the cursor IN the formula cell, in/on the text of the formula and then hit enter. Then the output is updated to the correct Count or Sum.

I am not sure what I might have inadvertently done differently to set up this kind of restriction on the worksheet.

Thank you for any help.