Oasis of memories

hello, I have issue with diablo 4 oasis of memories quest on ps4. When I finish this quest so after guidance of old man it just resets and I have to speak with Lorath and other 3 guys in town and after the conversation nothing happens. It says meet up with Lorath (again). I am stuck and cannot proceed with main story without this quest please help. Also please let me know how to get a mount cuz I am in Kehjistan and when I come back to Kyovashad there is no Donan in Cathedral of light nor additional conversation options at the stable master.
thank you in advance