I'm not really sure where the information comes from re: death in the IGI. The record is supposed to be an extraction from the parish record. It would be interesting if someone who has access to the actual parish record would read it to see exactly what is written.
At least on the microfilms, the christenings and burials are not on the same pages.
Perhaps someone more knowledgeable than I can help us on this matter.

I have run into this previously where the IGI noted a death that was incorrect--it was proved otherwise.

Did either parent leave a will? This might clarify the situation.

Donna