Context menu's not 3D/Classic theme on desktop

Hey all, recently did a fresh install of Win10 LTSB 2016 on my laptop, and have been through the steps to apply the classic theme and have ran into a slightly inconvenient issue, everywhere else my context menu's are the 3D border style like they should be other than my Desktop Context Menu's which just appear as flat and normal.
Sorry if I've been a noob and completely missed how to sort this via another post on the forum, as I've been through the steps to get 3D borders working via UPMCalc, but is there any solution to this I'm missing, many thanks