Intermittent one is either people using time-turners, Weasley’s don;t know about time-turners, so they think it’s showing one person in two places or If it showed two names for the same person, that might be an intermittent bug too, ie Quirrel/Riddle based on who he is at the moment.
Permanent bug might be someone floating in the castle who they know shouldn’t be there, perhaps Pettigrew, or Sirius, or someone who should be there but isn’t—ie Quirrell being unplottable.
Dumbledore & Snape are known Occlumens, but they show up on the map just fine.
In canon, the bug that Harry saw was Pettigrew on the map but he wasn’t actually there in reality.
I don’t think either of the glitches are Time-Turners. Time-Turners have (presumably) been used regularly in Hogwarts since the twins arrived, and it’s made clear that these glitches are new:
The Map was an extraordinarily powerful artifact, capable of tracking every sentient being on the school grounds, in real time, by name. Almost certainly, it had been created during the original raising of Hogwarts. It was not good that errors were starting to pop up.
Also, bear in mind that the official story is that the time turners are used to treat “spontaneous duplication”; if the map occasionally registers multiple versions of a “spontaneous duplication” sufferer, that would be written off as a feature, not a bug (just not the feature that the twins think it is).
Intermittent one is either people using time-turners, Weasley’s don;t know about time-turners, so they think it’s showing one person in two places or If it showed two names for the same person, that might be an intermittent bug too, ie Quirrel/Riddle based on who he is at the moment.
Permanent bug might be someone floating in the castle who they know shouldn’t be there, perhaps Pettigrew, or Sirius, or someone who should be there but isn’t—ie Quirrell being unplottable.
Dumbledore & Snape are known Occlumens, but they show up on the map just fine.
In canon, the bug that Harry saw was Pettigrew on the map but he wasn’t actually there in reality.
I don’t think either of the glitches are Time-Turners. Time-Turners have (presumably) been used regularly in Hogwarts since the twins arrived, and it’s made clear that these glitches are new:
Also, bear in mind that the official story is that the time turners are used to treat “spontaneous duplication”; if the map occasionally registers multiple versions of a “spontaneous duplication” sufferer, that would be written off as a feature, not a bug (just not the feature that the twins think it is).