Luc, Thank you for your responce, but I don't understand your stating "There is probably no mistake."
Joannis Verjans and Agnetis Noben had 6 or 7 children who were christened in Hoeselt, Limburg, Blegium.
One is listed as: Joannes Verjans christened 28 Sep 1798 in Hoeselt, Limburg, Belgium. His birth date is listed as 16 Jul 1798.
My Great Great Grandfather was Jan Verjans, birth date listed as 10, Jul 1798.
My point being: Joanenes birthdate 16 Jul, 1798
Jan birthdate 10 Jul, 1798
It is impossible to have two children born 6 days apart. The other option would be that Jan and Joanenes are the same person, but how can I find out birth name and which date is correct?