It is possible that during big lag, and mass refreshing as fast as you did could - very rarely - cause you not to be credited. But I have no log of what you did. If you're refreshing and letting the page load fully, it should have worked.
I really don't know how to proceed here. I've not heard of this report before. Is it possible you only had two full sets?
No, this is not possible - at least it where 7 sets - as i counted to 7 while refreshing until i looked the other way - keeping refreshing - and seeing the message for missing items when i looked on the screen again - i think it were 15 sets - but that's really really vague
But as i can't tell you how many sets i had and i refrehed too fast...
... i consider this as being mugged by "the system" part of the game
You can close this bug report and i'll be more caraful in the days to come.