Yes.
Triglavians do have a pattern as to where there are most likely to be seen, but yes you probably should consider that powerful NPCs can show up anywhere.
Dude, you lost a free rookie ship.
New Eden is dangerous, always has been and always will be. When you undock something, it can die either at the hands of NPCs or other players (see: 8 Golden Rules for EVE Online in this subforum).
It would make little sense to have a warning pop-up every single time you undock saying “Be careful! You might lose your ship!”
There is no shadiness going on here. Or at least not very much. 