I’ve noticed this for a while and can’t stand it anymore. When I respond to posts, special characters, notably the apostrophe, get stripped out. Sometimes commas, semi-colons, and dashes go, too. They all show up in the editor, but are gone in the published post. Occasionally I see this in someone else’s post, as well.
I’m using an iPhone 8 with all the brightest, shiniest updates (unless one came out in the past hour or so). I read through Flipboard, but I think it operates using Safari.
ETA: not happening now. It was happening just before I started writing this! Maybe it happens on first read? Intermittently?