I set up Filtered Questions RSS feeds on stackexchange.com. I have grouped the sites that I'm interested in into categories - one includes Stack Overflow, Software Engineering, SQA & Testing, Computer Science, DevOps, and others (about a dozen sites in total). Today, I got home from work and started browsing the feed. There were about 200 questions that showed up in Feedly. But I noticed that only 2 were from Software Engineering.
I know for a fact that between the time I left for work and now, more than 2 new questions were posted on Software Engineering. This means it's highly likely that I'm missing other questions in other groups as well.
I'm unsure if this is on Feedly's end or Stack Exchange's end, but if I have an RSS feed of newest questions (All Questions) on a set of sites, at the end of the day, I should have all of the questions in my feed.
Here is an example of a configuration that I do not believe is showing me all questions: