The view showing the US format...on what device are you viewing it on. If in a Browser, such as the AppSheet Editor or while running the Browser version of the app, then make sure the Browser app you are using is also set correctly to the locale you wish.
Any reformatting expressions inserted into the app?
Does the date display this same way on a mobile device? Is the locale set to desired setting on that device?
If all of the above check out as okay, then you need to submit this to AppSheet support as a bug. With the locale settings set equally, the editing and display of the saved value should show in the same locale format.
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