It's the first time that I have seen this kind of behavior.
I have other apps with dashboards using base searches and post-process searches and this never happened. It's the first time that I experienced this problem.
I searched for a solution and people say to always refresh all pages instead of each object, and it's what I always do in Simple XML.
Also had in consideration the limits of base searches, but I think that's not the problem since the limit is 500,000 and I barely have 30,000 events.