When creating with text boxes, always make sure your text box is at least 3-5 pixels wider than needed for the text to be entered. 

If you have a text box that barely fits the test, on some devices having just 1 or 2 pixels of leeway will force a line wrap and create overlapping text. This is particularly true of iPads. 

For more on using text - please watch.

Advanced Text Considerations in Boom Cards from Boom Learning on Vimeo.