That’s how Make IML are represented when copied out from the module fields. Try it yourself.
So when you paste it back in, the IML is converted back to how you are used to it.
For more information, see Autocomplete Commonly-Used Functions in IML (Mapping) Fields!
Hope this helps! Let me know if there are any further questions or issues.
— @samliew
P.S.: Investing some effort into the Make Academy will save you lots of time and frustration using Make.