When multiple users are in a list only one person's tweets are shown. (And when removed old tweets from the remaining person are shown)

[Zectric]

So I’ve been trying to create a simple list that shows my friend and me’s tweets.

I tried adding us both to a list, however only my tweets are shown:
https://twitter.com/Zectric/lists/tweets
EDIT: After scrolling down a lot, my tweets stop being displayed and his tweets from ~2 months ago are the only ones displayed… Still an issue.

removing myself from the list then shows his tweets, but from weeks ago, although he recently tweeted (in the past 24 hours):
http://i.imgur.com/8yTBULX

EDIT 2: It seems that the issue is that lists for some reason do not display @astrammc 's most recent tweets… Any way to fix this?
EDIT 3: So after more research, I realized that his tweets are @replies, and thus did not show in his user timeline, but in lists, they STILL do not show :
Any help will be appreciated, ~Zec

[niall]