When you create a column in a SharePoint list, it gets an "actual" name that never changes. Columns also have a display name that you can change. What you are seeing here is InfoPath's way of partially concealing the real names by showing the display names in your form, but there are some places (such as when constructing formulas), that it makes more sense to show the real names. I don't think there's much need to worry about this. Use the real names where InfoPath provides you with the real names, and use the display names as a guide, and you should be fine.