Hmm ... are the triggers in different levels or the same level?
I take it this is something the player actively walks into at some point after the game has been loaded for some time? In other words, you aren't trying to catch the player being loaded into a level by detecting that they spawn within a trigger or something like that are you?
It might be insightful to look at the osirislog.log file when this executes successfully in the editor. Then you can look at all the queries that the game makes once the player enters your trigger and start thinking about what could be different between the two modes. Is the game looking for specific tags or other values associated with the player? We already found one bewildering difference between client and game mode where the characters seem to be missing their faction when created through real character creation in the game and I'm wondering if there may be additional differences like missing tags, etc.