Help fixing this scrolling sprite problem

I've got a sprite when i want to scroll infinitely but i've got an issue where there's a gap that appears when scrolling. I've tried but not been able to fix this so i was hoping someone else can help me.

https://www.dropbox.com/s/061e7a3vyvy412b/sprite%20scrolling.capx?dl=0

I'm sure its something really obvious that i'm missing but i can't seem to solve it.

Here the explanation is in the event sheet.

https://1drv.ms/u/s!AjcW2ueud6qp1RNZKCydTfgZO6Tq

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Thank you and thanks for the explaination, really helped out. Appriciate it.