Sometimes a model appears offline in Chaturfier, while they are broadcasting on Chaturbate. Unfortunately they are blocking the country where Chaturfier's server is located. The result is that Chaturfier cannot see these models and you will also not receive online notifications for them. Ask these models to unblock all European countries.
Besides the reason in the previous question, it is also possible that some broadcasters chose to have "appear on network sites" off in their Chaturbate settings. Chaturfier respects this choice, but still provides a minimal and diminished profile of these broadcasters, so that its users can add alerts and be notified.
However, when these broadcasters are not very popular, for technical reasons, it is difficult to track them successfully and it is possible you will not receive a notification when they go live.
Chaturfier's outgoing emails are signed, encrypted, secured and authenticated with DKIM, SPF, DMARC and are explicitly opt-in. Chaturfier never sends SPAM emails! Despite all this, there are still Mail Transfer Agents and email providers that are under the impression that Chaturfier's emails are SPAM, and will actively block emails before they reach you.
As mentioned before, it appears that certain email providers are very stubborn in respecting all these email security protocols. Particularly web.de and gmx (with any TLD: gmx.de, gmx.com, gmx.net, gmx.co.uk, etc), to name just a few. There are others...
Besides the measures that have already been taken, there is not much that Chaturfier can do about this. My advice is simply this: change email providers (Gmail always works well) or change alert channels.
Normally session details are retained for a maximum of 4 weeks. For sessions that had less than a maximum of 50 users, the details will be retained for only 24 hours at most.
Online but in private or hidden show, or away.
Online but state unknown, these are broadcasters that have "appear on network sites" off in their settings.
Offline, not broadcasting.
Broadcaster has been deleted.
Chaturfier's ranking rewards a broadcaster's popularity and visibility. The ranking score is composed of several factors, including followers, average viewers and online duration, plus several internal factors such as number of defined alerts, for example. Over time the score will degrade and if a model does not regularly broadcast, they will drop in ranking. Scores and rankings are calculated and updated daily.
Chaturfier updates and tracks most broadcasters every minute. This makes sure you will receive those online notifications as fast as possible. However, statistical data, such as number of viewers and current position is delayed. This is how Chaturbate provides this info.