Flickr images don't work in Marker pop-up

Hello,

I’m having an issue where Flickr images only show once in the Marker’s media. When you hover once more the picture is gone. This only happens when using Flickr embed code. All other image sources work fine. Do you know any explanation to this?

http://journeyfarbeyond.com/canary-islands-dec-2017/

I would like to buy the pro version so I’d appreciate any comments.

Thanks,
Lucas