Xfce forum suggested fix for cursor inconsistencies:
Find name and size of cursor theme
xfconf-query -c xsettings -p /Gtk/CursorThemeName;
xfconf-query -c xsettings -p /Gtk/CursorThemeSize
and edit ~/.Xresources to add cursor theme name and size
cursor issue fix / Desktop / Xfce Forums
Xcursor.size: 48 Xcursor.theme: DMZ-Black
Manjaro forum suggested fix for systemwide:
System-wide application of specific cursor theme (Simple-and-Soft) - #5 by Rana
I only needed steps 2 and 3 for systemwide cursor theme