Yours frns had the bug too? Do provide your ID, IGN srvr ID, game version, device model for we need those info to submit bug. You can also report the bug ingame through CS > bug report . Hope it gets fixed soon asap.
We've also received reports of issues that are exactly like what you experienced. so, can you provide information about this case, such as video evidence when you invite friends or got invited by friends to play conquest of dawn
also provides other necessary information following this Bug Report Guide