It looks like your section has a huge min-height that should be removed.
Due to the fact that you’re using a Grid, the section’s height might enlarge your grid rows and cause the extra space.
In addition, your layout looks like a classic case for a Repeater.
Therefore, I would suggest to change it to a Repeater for easier future adjustments.
If you keep the Grid that’s fine as well, just keep in mind that you’ll have to change everything manually.