widgets modification is gone

when I select add text widget, it allows me to add a widget. However there is no box for me to put the text in. Please see attached photo. I have googled this problem, people say it is normal because of theme update. Please help. Thanks

Hey there,
I hope you’re doing well today

This is strange, Its hard to say from the screenshot, but is this happening from the Appearance > Widgets section?
To verify its not a theme issue, please try activating a default WorldPress Theme such as Twenty Sixteen, and try adding a text widget, and let me know your findings.

Best Regards,