As you know cPanel has stopped x3 theme and made paper lantern the default style, they have introduced “Retro Style” for Paper Lantern. The Retro style makes Paper Lantern look like X3 so that if you prefer the old and trusted appearance of X3, you can feel at home even when using Paper Lantern. It’s not a perfect implementation of X3, but with the silver chrome borders, blue-teal gradients, electro-blue world map page headers, and bubbly application icons, Paper Lantern can have the same familiarity that so many of our customers crave. Some might get confused as why cpanel shows X3 look even with Paper lantern enabled.
You can switch to Default Style of Paper lantern for those accounts which have Retro Style enabled by following method :
# ls -l
lrwxrwxrwx 1 $user $user 58 Apr 27 2016 current_style -> /usr/local/cpanel/base/frontend/paper_lantern/styled/retro/
Just unlink current_style and it rolls back to default style of paper lantern.