The URL is different from the one you have chosen because Brevo tracks the clicks of your contacts. Through this, you have access to the number of clicks per link, a list of contacts who clicked on each link, and the heat map. This does not affect link's target, contacts are still forwarded to the pages you have selected.
You can deactivate open, click, and link tracking using the anonymous email tracking option. To learn more, check our dedicated article Can I anonymize the tracking of opens and clicks for my email campaigns?.