Tow /toe

I haven't seen this particular error but agree with you that it's "toe" the line.

I have noticed it several times recently but only on GN!

It's the problem with the English languge! Many words sound the same but have different spelling, thus confusion reigns.

Think of the meaning - standing in a line, side by side with everybody’s feet just touching a line painted on the ground.
How can anybody be confused?
Similarly with “rein them in” nothing to do with kings or queens but the reins on a horse’s bridle.

MawBroon: Think of the meaning...How can anybody be confused?

Well, as I see it, this is the difficulty. People don't think. If they did, nobody could ever write "I could of done it".
Not so long ago I saw the following scribbled note on a front door "We won't by from you so dont waist are time".
Obviously not much thinking there.

Oh dear Greta that was bad, do you think it was a joke ?

I don't think it was a joke, Sodapop. I believe a lot of bad spelling can be attributed to poor speech. Also, many people never consult a dictionary to check spelling.

Trouble is you have to be able to spell to consult a dictionary ?

True, BBevan. It also helps if you know your alphabet!