@liltaco - Thanks for your response!
Apaprently the "main.py" was forced in project mode. I not sure why, but I believe it was because i called function named "func_STR_ins_or_del" from a file that had a .py extension like "whatever_project.py"
I read in the help of repl.it that calling a .py fille will force your main.py to go in project mode.
To go back in Eval Mode I had to delete all the extensions of my project from the file tree.
According to repl.it help docs "In eval mode, you can evaluate code from the console (including values declared in your program)."