If you purchased a land from another player via OpenSea, you will encounter a glitch of seeing this land in the game immediately. This happens because we are not getting the automatic update from OpenSea.
No need to worry, your ownership of the land is secured. We just need to update the landowner list mannualy for you (as a temporary fix). Meanwhile, we are working on the automated solution to make this experience simless.
Please use the Chat function in this support page to create a ticket.