Overlapping Text when editing a fillable text box on IOS

I have a few users walk to me with this issue, the have a form that that fillable text boxes. Everything works, but when you go to edit the box, if you back space the text is still there. This is not an issue because once you click out of the box it updates. But if you back space and then start typing the text overlaps until you click out of the box and then it updates. This cause some of my users to get confused. I was able to duplicate this issue on an ipad and iphone running the latest app version and ios version. Any tips? I have tried different PDF forms as well and same thing.