Well yeah, the point of that widget is not to show recent activity in general, that's what the /recent page is for. This is just meant to show recent topics, which is why is goes to post 1.
Creating topic on mobile
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I'm running 0.5.3 stable. Ok I will try tonight when I'll be at home.
Edit: @julian I tried to disable plugins, it's still doing the same thing unfortunately. The quick solution that I've found for the moment is to deactivate the upload of a thumbnail for topics.