Run the following macro and see if it fixes the problem:
Code:
Sub ResetListFontFormatting()
'Macro created by MVP Stefan Blom, March 2017
'Originally by MVP Doug Robbins
Dim LT as ListTemplate
Dim i As ListLevel
For each LT in ActiveDocument.ListTemplates
For Each i in LT.ListLevels
i.Font.Reset
Next i
Next LT
End Sub
For assistance, see
http://www.gmayor.com/installing_macro.htm.