iOS table view in modal gets shorter every time view appears

Here's my set up: I have a tab bar controller as my root view controller. In one tab, I present a modal on user action. The modal has a navigation controller, and view controller with a table view as it's root view controller. On another user action, I push another view controller. Every time I pop back to the table view, the content size seems to have shrunk. The table view gets shorter and shorter in appearance. This does not correlate to change in size of the table view. When I log i always get back the same tableView size and content size, but the content is getting eaten from below.

via Chebli Mohamed