Hello there,
As you probably saw in other threads within our community, there was a reporting issue causing the revenue and EPMV data for the 11th and 12th August was showing delayed. This is issue is resolved already.
Please keep in mind that the Dashboard reporting is not in real-time. Stats (i.e. revenue, visits, traffic, earnings) for each day are updated at 12pm (midday) PST the following day, so your revenue for today will update at 12 noon PST tomorrow. Even then, revenue reported in the dashboard is estimated and is not considered final until the various ad networks report, which is normally on a net 30-day basis.
Looking at your setup and I can reassure you that there are no technical issues and the decrease seems to be part of normal fluctuation.
There are many variables that impact EPMV (earnings per thousand visitors). Factors such as traffic source, pages visited, device type, engagement time, and ad rates can all influence how much a website earns. On some days, you may have users who are in very high demand from advertisers - and so EPMV might be very high. On other days, you might have users who are less in demand from advertisers - so EPMV might dip. Some months, advertisers might spend lots on ads in your niche (so EPMV will improve); at other times of the year, they might spend less.
Some fluctuation here is expected - as small shifts in audience or advertiser spend will see dramatic changes. That's why your revenue and EPMV can fluctuate even without any changes to your site or setup.