First of all, thanks for rewarding contributors with an ad-free experience, and for introducing HTTPS, at least for part of the user base.
I have GamepediaPRO and am viewing the wikis via HTTPS, but Safari is not showing the padlock icon in the address bar. According to users on the Apple Support Communities, this means that Safari has detected insecure elements on the page. Looking at the web inspector on my Minecraft Wiki profile page, it seems that you are still serving some images (like the level badge and the Twitter/Facebook/etc icons) through plain HTTP. You may want to look into the issue and make sure you are serving all content, including images, through HTTPS.