Links opened in container reopen without container without permission

I really appreciate the container tab option for my browsing, as it affords me more privacy and I am a stickler about my privacy. However- I have been having an issue with links that I am attempting to open in a specific container that will load, and then immediately reload into the tab without a container. This has happened several times. The most recent example is that I clicked on a link from FB, a site I tend to avoid, and specified that I want it opened in a FB tab, as I don't trust them not to track me beyond that. However, the link loaded in the FB tab and immediately again with no container whatsoever. There was no request, no warning that I had set up the "multi-account container" and did I want to use it in the designated container... nothing. This has happened with links before as well.