I seem to be only getting points on 2 sometimes 3 channels about twitch-channel-points-miner-v2

Oh, so "["streamer1", "streamer2"], # Array of streamers" will prioritize them from left to right? If so, you should definitely put that in the documentation!

[Tkd-Alex]

Yes, It is correct / normal. This is a Twitch limit.
You can read a comment in the original repository (I've also included this comment in my code):

# Twitch has a limit - you can't watch more than 2 channels at one time.
# We take the first two streamers from the list as they have the highest priority.

https://github.com/gottagofaster236/Twitch-Channel-Points-Miner/blob/4ab4c741ccb3534dead0ce61f184895f9043528f/watch_minute.py#L29-L30

And if you are not convinced search on Google, I've found something on Reddit:
https://www.reddit.com/r/Twitch/comments/htr6iy/watching_multiple_streams_viewer_count/

Oh, okay I seem to have skipped that part. Is there a way to maybe change the priority of some streamers, because the "list" seems to be just a random order? You would then have to permanently save my followers and when I start up the script just check if something has changed. The easiest way to do this would be to just give everyone a number.

[Tkd-Alex]

If you write manually the streamers then the priority It's the same that you have write.
If you download the followers from Twitch the order It's the same of Twitch and I think It's based on followed_at field. The last that you have follow have higher priority.

[scryptio]

Don't want to open a new issue for this. But is this only related to using programs? Or is this info outdated currently?

I have 6 tabs open where I actively collect time for streamelements giveaways (you gather points / 10min watching) and it works perfectly.

[Tkd-Alex]

streamelements are different from Twitch points