Most new but most problematic

[badablek]

but it does not appear in the "Settings > On startup > Open a specific page or set of pages" section;

Hello,
of course it does not appear...this is a pinned tab which has nothing to do with the start page(s). This is not a homepage, only a pinned tab.
And the point of a pinned tab is that it's loaded EVERYTIME you launch the browser. Like on any browser. I don't see any security problem, because pinned tab are set BY THE USER, nothing else can pin it automatically. Maybe you have hit by inadertence the keyboard shorcut (ALT+N) or right-clicked the tab and choose "Pin tab" ?
I can browse this website without any problem (latest CB portable or not, x64), and no, it didn't pinned itself on the latest revision of CentBrowser.
If you have kept the user data, this is easy to fix (and see it's not a bug in CB) : go on the pinned tab, press ALT+N to unpin it > close the tab > you're done ! It will never respawn.


ps : there is a lot of references to this website, probably because of the cache data.
Finally, no offense (this is really not the purpose of my answer), maybe I'm wrong, but :
1) I don't see the point. If you are experienced, you should know about pinned tab, you should also know that it's not related at all with the start page(s) or any option in CentBrowser.
2) you should not, they are not guilty at all 
3) not true...CentBrowser team is working hard to follow Chromium/Chrome releases. But this team does not have hundred of developers dedicated to this Herculean task