With iOS 11 safari, input textbox cursor are outside of input textbox. We did not get why it is having this problem. As you can see my focused text box is email text input b
This issue goes beyond Bootstrap, and beyond just Safari. It is a full display bug in iOS 11 that occurs in all browsers. The fix above does not fix this issue in all instances.
The bug is reported in detail here:
https://medium.com/@eirik.luka/how-to-fix-the-ios-11-input-element-in-fixed-modals-bug-aaf66c7ba3f8
Supposedly they already reported it to Apple as a bug.