I assigned the pro version as default template, its working. Which page that you assign for pro version before?
NOTE: You are using old joomla version 3.6.5, the latest version is 3.9.13 (3.9.14 coming soon), please update
Gantry 5 Particles 2.2.2 released with with new features (lazy load image, new Card Slider) and bug fixesChangelog
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