June 16, 2018 at 7:00 am
#9084
Keymaster
Looks like your parent style.css has been edited.
If you look at line 980 (Appearance -> Editor)
What originally looks like this:
#widgets-wrap-header {display: inline-block;}
Has been changed to:
#widgets-wrap-header {display: inherit;}
You probably changed it and forgot about it.