Why is value "empty" in Do a search 'data':count

hi
im working on making progress bar using data and have some problem on it.
I count number of data by ‘Do a search + :count’ method in integer as content format and it shows proper number in input box.
but when i inspect the number in preview page, the value is ‘empty’ like the below picture
why is that? and how can i correct empty value to number value.
Thanks in advance!

image

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