I just noticed that on one of my bikes, the dropout adjusting screws are screwed in with the heads facing the axles. I've never touched those screws on any of these 3 frames and bought them all used, so they all came like this.

Was it just an "oopsie" by the previous owner? Or are there valid reasons to screw them in this way? Like maybe having the large head face the axle provides a better stopping point?

The one difference is that this is a Japanese frame (Fuji), whereas the other 2 frames are Italian and Dutch, so maybe this was the Japanese standard back then for these screws?