Looking at the first current post you made with the three hog picture I see what you mean.
Since they are not in the gallery I would suspect that you may need to tweak one setting.
Control Panel ยป Feature Settings
Max width for images used in posts?
Specified in px. Uses browser scaling. Leave blank to disable.
I think the default is set to 400, at least mine is set to that and I don't recall changing it.
But anyway I would think that setting should apply to the topic as well as the portal setting.
