If you already use another Open Graph plugin, Jetpack won’t output any tags, and will let your other plugin do the work.
If you’d like to disable Jetpack’s Open Graph Meta tags even when you don’t use another Open graph management plugin, you can use the jetpack_enable_open_graph
filter, as explained here:
https://developer.jetpack.com/hooks/jetpack_enable_open_graph/
You can add that code to a functionality plugin like this one, or to your theme’s functions.php file.