Plugins showing randomly

I run the liberta.vip platform, including a peertube instance at https://video.liberta.vip . I noticed sometimes plugins won’t load and need a refresh to show up. As i see many spam accounts, I guess the problem happens most of the time… So captchas show randomly just as FB/TW sharing plugin on player page, even for freshly uploaded ones. Has anybody ever noticed that? I use chained nginx’es proxies and latest peertube.