Tips Indicator bugged?

Maybe it's just me, but logged onto an old Stalker of mine, wanting to wrangle up a few alignment merits so went to Sharkhead and started slaughtering stuff. I think I killed stuff for around 10 mins (and this is a Spines Stalker he shreds through lots of foes fast) without any indication of a tip dropping.

Finally frustrated, I open my tips and they're full. Does this extend to other stuff like enhancement drops? Is it just me?

I haven't noticed a pattern, but that can happen with any onscreen notification. I ran an STF last week and someone said they didn't get a Notice of the Well. What they meant was that they didn't get an announcement on the screen. It showed up in the chat log.