That's it, I'm done with those online events.
My goal was to be among the first 100 in the current one, so I spent a part of this afternoon replaying the same levels again and again until I got bored, only to find out that this stupid system is once again cheating or malfunctioning or whatever. I wasn't playing offline, the connection hadn't been lost, yet for some reason I can't explain only two of all the relevant medals I won today were actually registered. Everything else was in vain.
I used to like these events, but from now on, I will only bother to meet the minimum requirements to take part. For example, if the requirement is to get one medal in Level X, I will get exactly one medal in the respective level, make sure that lame system registers it, and be done. That way I will at least get something (a retro costume and 10,000 RE points in this case) without wasting more time than necessary for nothing.