Edit: Checked again this morning and it appears to be working as intended.
Previously it looked like I was losing any badges I already had when I handed in the daily - but my accounts been generally misbehaving in game for the past few days until Sundays maintenance which seems to have cured it.
Already raised in game as a bug. Posted here so other players can post if they are seeing the same thing.
Whenever a character with LESS than 7 Mark of Exploration hands in their B'Tan daily quest then instead of ADDING 7 marks to their existing total the game RESETS their total marks to 7. This means that on a daily basis that tens of thousand of marks could be lost by any players that are spending the badges as they are earning them...............
Could you provide a more detailed description, because I have never expirienced anything like this, and im not sure i understand th issue.