so i've realized that for me, sometimes that exchange all option has a bug that will show you, your partner has exchanged the hogyoku too, but in fact when you refresh, it isn't exchanged yet, is it happening only to me or anybody else ?
Yep happens seems to be between different quality partners, best to take them off first then exchange, then put them on the other person that way you save time having to refresh then take them off then put them on.
AND FIX IT! dont mind us sounding like its acceptable because it isnt and its annoying :p