Toe Shanks | Golf Monthly
The only other way to narrow the reasons down some would be to know what the general pattern your reasonable shots are in terms of the direction the ball starts off in, the curvature of the flight, is the flight towards the low side or high etc.
But it is an you elude to in the 1st para a real unusual occurrence not that common at all. Often folks have told me that's what they do, hit a few shots, shank a few, & then say see, right off the toe, but they've really hit a pure socket.
But that said, if you are really getting some right off the 'toe end', it would likely mean there could be a lot of general strikes that are the toe side of middle strikes as well, these would sound a bit 'slappy'?
Likely will have something to do with the way you're set-up, whether you lose balance & posture through the swing motion. How the club (on what path? etc.) is taken away from the ball.
Without knowing a little more, or seeing what you do can't really give you a definitive answer. Even if someone else was hitting these right off the 'toe end' strikes that wouldn't mean they'd necessarily being doing it in the same way as there's a few things folks can do for a strike to be very near the toe.
Which way do the divots go, left or right? Or are there no divots to speak of at all?