The editor is not working, every time I try to edit something it deletes a character. I have never had this issue.
Can you reproduce this error on another browser? If so try another PC.
If it’s only happening on your PC it could likely be an issue with your keyboard (usually drivers).
I fixed it but the fix is annoying. i have to refresh the page, but when I do sometimes the code will not save. 
Also, I forgot to close this.
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Do you experience it on Android? There could be a Google keyboard bug. I sometimes have a bug when I try to delete symbol, editor copy this current line after it.