When it comes to border, it is quite fascinating to first consider that English as we know it, is totally screwed and bastardized.

Bord-er in its original sense was made of wood. A shield actually. In this sense it is also interesting to consider what is painted on shields? Even today, shields convey jurisdiction.

Later, it is related to the bord of a ship. Hence: star-bord. But also poles driven into the ground to encompass a piece of land showing it is yours.

But also "platje" better known to English speakers as plate. Bret is equally connected to bord, as it means a playboard, like a chessboard.

I dunno what happened to English past the 14th century. But there once was a time when we in North Western Europe could easily comprehend one another, despite the differences in speech.

So, a border is nothing more than a series of poles driven into the ground to signal an allodial claim.

A boarder is equally connected to it, as the boarder actually enters a ship, on board, or on bord, that person enters a different jurisdiction as the shape and size of the ship.

This also shows to total incongruity. Border is a thing, yet a boarder is a person. You can't make this shit up.

border collie: great at rounding up sheep

boarder collie: eats your food, sleeps in your house, and only really ever helps out with sheep when forced to

well it's probably not actually more common, rather more people feel correcting spelling mistakes is a legitimate conversation and therefore more people become aware of it.