I'm viewing toots from other instances with this account on several third party clients including Toot! (iOS), Tusky (Android) and Cuckoo+ (web). If there is actually a #QOTO style quote (i.e. "QT: [link]") at the end of a toot, the quote part, which was manually typed as other instances have no quote feature, would disappear.
It only looks as expected when I use qoto.org (web client) or use an account of another instance on any client. The problem may be on the server-side of qoto.org.