Thank you for
reaching out on the community and telling us about your issue. Does the budget not show up at all or is it showing the wrong budget? Does it show all of your accounts? Do all your accounts show up as well?
If you haven't already I would recommend taking a look at this article here as well for troubleshooting on the mobile app. It has a step with help getting the budget to display on the mobile app.
Please let us know
if this helps resolve the issue for you.