Some communities posts not showing when I go to the comm in apps vs but do on browser

I use Summit for piefed.social, and I noticed some communities are showing "no posts". I thought it was the app's issue, since when I open piefed.social on mobile browser and desktop browser, the erroneous communities show up just fine. The weird thing is, posts from those instances show up just fine on feeds and when I open them.

So I tried another app, Blorp. and it is showing the same error. Not showing any posts when I visit the comm, but still showing in feeds and when I open posts directly.

the communities I are lemmy.ml based. specifically I tried !android@lemmy.ml and !sbcgaming@lemmy.ml. I didn't try a lot of other communities or instances, but so far it seems consistent with .ml.

considering the infamy, I thought it is defederated, but either I don't know how to use the instance search at https://piefed.social/instances or what, but I can't find anything that indicated that instance is defederated.

I only went through past posts on piefed_help and found this post and this thread from a month or so ago describing the same problem as mine.