Text Entry on Ipad

Hello

This post i maybe a little bit dated but i have always the same bug with ios
You can take a look a this example:
https://www.atdesign.be/elearning/test5/story_html5.html

When you test on ipad or iphone, when you click on the third textfiled, keyboard appaears and disparreas immédiately
The olnly way to fill in correctly the form is to begin with the first filed and then use arrows to go down in other field

Is there a way to avoid that bug?

Thanks