What does it mean when a buyer contacts a seller and his message comes with your gig link, and sometimes it doesnt. Please what is the difference
It depends on where they started the conversation.
They can use the Contact button on your profile or on your gig pages. If they start the conversation from the gig page then you know which gig they are asking about.
So which shows the gig linker ant the beginning of the chat?
It shows gig link in chat when they contact you from that gig