We have been using Amplitude for months and this month (July 2023) we noticed that the new users and current users on Amplitude is off. On July 12, it showed having 1000+ MAU for the month of July and hundreds of new users. When I checked back on July 14, there were less than 100 new users, a couple hundred active users, and hundreds of dormant users. We use Firebase as well and can see that we have hundreds of new users but Amplitude is not reporting them.
Please help because this is throwing off all of our analytics. We have not changed anything in our code base that can account for this change - especially since this happened mid month.