Flat Earthers hold their belief because they know something's off about the official narrative and it's the closest they've gotten to the truth. It's the most stigmatized and ridiculed theory, not because they believe in a flat earth, but rather the other truths many have uncovered along the way.
(media.communities.win)
Speculation
I don't claim to know exactly what the earth is. However flat earth makes the most sense to me. Most of the issues can be at least partially, if not fully explained. But of course there is always some mystery left.
I'm not sure what you're referring to about the stars. Maybe give a specific example.
If you are at different sides of our Earth north/equator/south you will be able to see certain stars the other can't. Polaris the North Star for example.
Other side will see Australis Polaris the South star. There are also stars which should be visible, but are cut off by line of sight.
The rotation of the stars also reversed when viewing from north and south. Flat Earth has the flat water as their strongest argument.
Water is the key to many secrets within our universe. I should also note the other person I work with decoded the R.Fludd Philisophia image. I would decode that differently, but I haven't gotten around to it yet.
Polaris can also be used as a flat earth argument. It can always be seen from the same spot, which indicates that the earth is motionless.
We cannot see for an infinite distance so not being able to see Polaris from the south doesn't necessarily disprove flat earth.
https://youtu.be/IOSW_LAs67Y