Ninox Iphone Stuck on Date Field Screen

We have one date field that for some reason get stuck on the select date screen on iPhones only. There are no permission restrictions or anything and it seems to only happen with one field as we have other date fields that work fine. When you click on the date field, it doesn't allow you to select a date, you can't click the clear button, you can't click the today button, it essentially freezes on the screen. the only way out is to force close the app. any suggestions? is this a bug?