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Random stranger popping in to offer help. You should be able to fix that problem by altering the relevant portion of your coding into:

.ljuser img[src*="/img/userinfo.gif"], .entry-header h3 img[src*="/img/userinfo.gif"] { width: 0!important; height: 0!important; background-repeat: no-repeat !important; background-image: url(https://imgur.com/XWb13KU.png) !important; padding: 6px !important; background-size: 8px}

.ljuser img[src*="/img/community.gif"], .entry-header h3 img[src*="/img/community.gif"] { width: 0!important; height: 0!important; background-repeat: no-repeat !important; background-image: url(https://imgur.com/PwCsvwN.png) !important; padding: 6px !important; background-size: 8px}

.pic-poster img[src*="/img/userinfo.gif"], .pic-poster img[src*="/img/community.gif"] { width: 0!important; height: 0!important; background-repeat: no-repeat !important; background-image: url(https://imgur.com/JlGeD0c.png) !important; padding: 0px !important; background-size: 8px}

.lj-entry-securityicon img[src*="/img/icon_private.gif"] {width: 0!important; height: 0!important; background-repeat: no-repeat !important; background-image: url(https://imgur.com/pan5Pr7.png) !important; padding: 5px !important; background-size: 8px}

.lj-entry-securityicon img[src*="/img/icon_protected.gif"] { width: 0!important; height: 0!important; background-repeat: no-repeat !important; background-image: url(https://imgur.com/4Dhntrk.png) !important; padding: 5px !important; background-size: 8px}

Basically, the images are now https instead of http. You could also just add the s to the target images, but doing it this way makes it target either one and could possibly cause less issues down the road.

I tested this with the developer tools in my browser and it appeared to work, so hopefully it'll work when you use it!