I had a similar issue with my Atlas display (you didn't mention which display you have). The daily, 48-hour, and annual totals were correct, but weekly and monthly totals kept resetting back to zero and rarely got over 1/10th of an inch. See the photo of my display. The picture was taken on a Thursday near the end of the month, so the weekly and monthly totals should have included the 48-hour total - but did not.
I contacted Acurite customer support and sent the picture of the display values. They replaced my display and asked me to send the old one back so they could troubleshoot. The replacement display has never had this problem. [ You are not allowed to view attachments ]