Wizardmons Ghost never made sense to me

So me and a friend are talking about season 2 of Digimon. I've been questioning for years about the whole concept of Digimon being made of just Data, We see Wizardmon come back as a ghost to warn the Digi-Destined of a great threat heading their way right. So how is it possible that wizardmon was able to come back as a ghost if Digimon are made out of Data