Missing <nick> </nick> field in previous days offline messages in group chat

When I joined to a group chat room, we have set discussion history along with initial presence stanza as since attribute and values passed is in UTC time. When I received offline messages, I found that all other messages except messages send on today is missing field

• Offline messages received, which was sent Yesterday

adataHi how are you

• Offline messages received, which was sent Today

adataadminoneGood morning

Please help me whether I’m missing some configuration settings or is there any solutions where I can overcome this.