Hello Frank,
This is most probably the result of something I learned here at the Forum, for example Egbert explained this 2 years ago. I give you the translation of his information:
From the middle of the sixteenth century, the government also interfered in the contracting of marriages. In October 1656, the States General (Staten-Generaal) issued the Marriage Regulations. In it they laid down conditions for the validity of a marriage.
Only a marriage concluded for a Nederduits-Reformed minister or for the aldermen (schepenbank) was legal.
A marriage contracted for a Roman Catholic pastor was not legally valid. This also applies to a marriage concluded for a minister of another Protestant denomination. From that time on, some Roman Catholics married twice: once for the aldermen or the clergyman and once for the pastor.
bhic.nl/onderzoeken/forum/verschil-huwelijk-gaarder-rk-en-schepenbank (opent in een nieuw tabblad)
So regarding the marriage you refer to:
The schepenbank marriage was the only legal option for the Roman Catholic couple.
The dates mentions seem a correct order of the procedure.
The church wedding was in fact only the religious and ceremonial confirmation.
It didn't legally matter in this case that it took place before the schepenbank wedding.
I have at least one couple among my (Catholic) ancestors who in the 17th century married twice for the church: first Nederduits-Reformed for the legal registration and 2 weeks later for the Catholic church. This combination was also an option.
With regards,
Belem