You need to rent “Pride and Prejudice”. (The version with Colin Firth)
Yep, that’s an excellent version of Pride and Prejudice; almost 100% faithful to the book, which stems from a time when first kisses at the altar were far more common than they are today.
Back to the article - it's unusual but not creepy. A kiss is traditionally meant to seal a covenant. Until the last century or so - when cars made it possible to get far away from parental gazes very quickly - purity was a valued thing.
I know another couple who shared their first kiss at the altar and they are far from creepy - just happy with three children and 15 years of marriage behind them.