Question: Normal text instead of maple input at copying

I'm working with a two Maple modules, I try to merge them. A few days ago I want to copy and paste a procedure from a long worksheet to the other one but the type of the pasted code is "Normal" not "Maple input". The "Normal" code doesn't work, not even if I change the type to "Maple Input" (It changes only the style of the code). So my code looks like this:

I worked with Maple earlier but never had this problem. I tried it with Maple 16 x86 and Maple 17 x64 on three different computers that didn't solve the problem. I started to copy the code to an empty worksheet. I can copy text to the end of the new file but I can't copy to the middle of the code. Do you have any idea how can I solve it? Thanks for the answers.