JSON Code not working when calculating Days Since Received

Rob_Elliott Hanne_Lauritzen 

Thank you both for your comments. I've made the change to the column name to avoid special characters and also changed the end of the coding to "86400000" versus what I had. I'm farther along than I was before and actually have a number displayed now, however, I'm getting a seemingly random number in the "Days Since Received" column with every response now showing "20016". I'm not sure how this number comes to be, as the dates of my now "ReceivedDate" column are different.

I also created a new test column with the JSON, just to see, and it also displays the same.

For clarity, my JSON is as follows now:

{
  "$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
  "elmType": "div",
  "txtContent": "=floor((Number(@now)-Number([$ReceivedDate]))/86400000"
}

Any ideas on this one?