Acrobat Pro Copy and Paste issues

I have been working on a collectin of forms for my customer. The base form is created with combination of text fields, radio buttons and check boxes. I have to manipulate the content to squeeze some barcodes on the form and put some simple text for automation. I get the first form built and save it. I open it and save it under a new name, then make adjustments to it. The copy and paste works 50% of the tiime when I am copying the barcodes or text from one form to another. It does not make any sense. I have closed acrobat and reopened it so i have just 2 forms open, my source and new form. I tell it to copy with formatting, it shows the status box in the bottom corner that its copying to clipboard. I try pasting to the same document and no joy. I have gotten in the habit of trying to paste to the same document i am copyng from to confirm it has the correct item. Sometimes it is pasting the fields i copied several minutes earlier. Why is this so inconsistent?