I like to imagine that because of Wen Yuan being raised in the burial mounds for a short bit, and also wei wuxian casting protection spells on him, He becomes VERYY sensitive to ghosts and other paranormal creatures.
Unfortunately this only applies to him when he was young, because after awhile all the protection stuff just wore off and Wei Wuxian wasn't there to renew it. And as he cultivated he was also cleansed of any remaining dark energies that might've stuck onto him during toddlerhood.
But for a short time, when he would go to the Jingshi, he'd see Madam Lan. Or when he visited Wei Wuxiand grave, he'd see his ghost.
A-Yuan spending time with his uncle and his grandmother :)














