At last a comparison! Please recall a comment I made here in bugs&sugs about the workaround I had come up with in order to sign into this website; if I myself can recall it .. it went "It's ok, I've got a workaround: Pressing Alt then holding it while I right click my cursor on the ghost dropdown I activate with my mouse-over during sign-in gives me access to the textbox and I can type into it".
Not the exact wording. These things age like fine camembart ... usually. But not this time. Please make this small-dog-at-eye-level-coffee-table-camembert happy by recoding the dropdown for this control EXACTLY LIKE the "Forum Message" comments awaiting/count "View all notifications" control.
THERE ... all I have to do is move my pointer to any "Re:" or "view all notifications" and just click to access.
Yes/yes(no). The sign-in disappears BUT is touchy. And by that I mean using ALT I can activate it's second-clickedness.That second click is also where I could type in the two sign-in parameters. There are two so I'm saying to myself "typing in the top textbox my address, I'm going to have to click again to type in my password".
The notifications works as expected. There's no need to use ALT to keep it from vanishing as I descend the control with my mouse "overing", if you will. And that's the essential difference, two textbox inputs as opposed to one or more notification underscore-highlighting-on-mouse-over links.
Recall how skiddish these "transparent" HTML dropdowns were way back when they first appeared. Sometimes they showed text through them and sometimes they had utterly no &hoTkey (T) activation patency, etc.
I'll be the first to admit that the days of my dark-background/light-foreground "Tools/Internet Options/General-Accessibility/Formatting/all-ticked" are probably numbered and that using a mouse, as the new workaround proposed below suggests ... really, if only the keyword weren't "click" here.
Will say this, in my defense, other sites don't hassle me this way.
Seriously though, it could be your email server, or something in between. Our code doesn't loop 4 times and if we had a systemic issue like then chances are we would have seen it either in testing or real life, not to mention the hordes of angry people yelling at us.
If you can look at the meta data on the emails themselves you'll be able to check if they are the same (as in, the exact same) email, or if they are separate emails we've sent individually. That may help narrow down what's happening.