Federation problems with the Brazilian instance lemmy.eco.br

I can't see a lot of posts from the lemmy.eco.br instance. Take for example the brazilian linux community, observe that you can't see any posts from this instance, but you can on the original instance:

linux Brazil from programming.dev

linux Brazil from it's original linstance

The lemmy.eco.br instance can see our posts without problems, so I'm assuming that the problem lies here. Am I right for assuming that?