It’s one thing to define history, culture and race and ownership to land and/or sovereignty. You can have the same heritage but different in nationality.
But yeah the situation is kinda messy. It’s like a government was overthrown in a military coup, previous government and some loyalist evacuated to some remote place…

It’s confusing, but in a nutt shell without going into a history lesson is that the island (Taiwan) is 100% autonomous, with it’s own constitution, army, democratic government etc. But China “Claims” ownership of Taiwan, and sees the Taiwanese as more like a rogue provenience. So yeah many Taiwanese don’t like to be…