I don't really know how to explain this, but weird things happen if we don't clear the cache every day.
So if it goes a day without clearing the cache, the address is something like https://......com/nb/ and then the ads doesn't show up - but if you remove the last / so it becomes https://.......com/nb then they work? and if we clear the cache then it works properly as it should again.
What is this, and how do we fix it?