Trouble when writing code - erasing

Hey there! Since I updated the site every line of code I try to write erases the code I had before. It is very frustating and it makes me not want to correct my mistakes since I have to write everything again. Can you guys enlight me? What can I do? Thanks.

Hey @leroposso,

What do you meant by erasing the code?

it writes over older code.
print(hbyeo’) # i write and deletes the next three letters