Ken has the proper response before I got mine completed. However I will post what I observed and wrote since it is interesting...
Sorry have no thoughts, but in looking at the data in your webpage it does not appear to be a day off -
Your report script page shows 8.16" for April to the 27th with 19 rain days and nothing yet for today (April 28).
Your WU shows the same 8.16" to April 27 with 19 rain days, plus 1.46" for today (Apr 28) for a total of 9.62" for 20 rain days.
Your Weather34 shows the same 8.16" to April 27 with 19 rain days, plus 1.46" for today (April 28) for a total of 9.62" for 20 rain days (I believe this comes from your WU history).
Your PWS shows 8.39 to Apr 27 with 19 rain days and nothing yet for today (April 28). Five days have different rain compared to your reports script page and WU.
Your webpage home page dashboard reporting at 6.20" and 17 rain days seems to be short and missing some rain days.
Can you tell if your local saved log compares to the uploads or to the dashboard home page?
Enjoy,
Paul