My progress keeps being deleted

My progress keeps being deleted. Im trying to complete my work, and it keeps being deleted. I have gone back 3 or 4 times already.

Can you describe what is happening further? Do you mean that it is not remembering that you have solved challenges? Are you saying that the code to challenges is not being preserved? Are you saying that the code to the challenge on which you are currently working is disappearing while you are typing?

Perhaps take a screen shot of what it is that you are seeing.