Does anyone have an issue whereby they use their front washers, but some leaks out the rear washer?

Tis annoying looking in the rear and seeing a streak of leaked out washer fluid

Yes mine leaks a little, just enough that if I spray the front windscreen and then park facing up hill there is a dribble down the back window when I return the the car. I'm assuming it is because there will be one motor which spins in opposite directions depending on which window you are spraying and a little goes the wrong way as it spins up. Same happened on my previous Fiats so don't think a few drops are that abnormal, just a bit annoying.

It's like a little stream and when the water evaporates you get a white streak of fluid

I have noticed mine also leaks from the rear washer jet, it also leaves a white residue on the glass which does take a bit of cleaning off, also on a recent unusual hot afternoon it also looked as though it had dribbled out leaving a long streak on the glass.

Never had this issue with any previous car so it does seem odd.