Yes, it looks like there is a specific conflict with Gourmet Mobile going on with iPad Pros and Air 2's and possibly some late generation iPads that was brought on by the release of iOS 13.1.2 and 13.1.3. Our devs are looking into this now and will do an update soon. It will be an automatic update when it is released so you will be notified.
As a side note, we have had reports of users having success opening Gourmet with the iPad in the portrait position. If tried in landscape it will not load the app but once Gourmet is opened in portrait mode, it has been reported, users can turn the iPad to landscape and Gourmet will work fine. Even switching between apps with no issue. This is new info we are testing now but perhaps give that a try and, if you could, let me know if it works.