Copy-paste text problem

I can only assume that one of the many complicated on/off systems is on the wrong setting. When you highlight a section of text and then go to the top bar and press 'Copy', go to the place where you want to paste it and far left is the paste icon, press on this and there are several options. If you want the exact replica press the little arrow underneath the word paste and the click on the first icon that appears.

For those who may experience same problem, I found an answer. I was working on a Mac but I opened the doc up on a PC then it all copied/pasted perfectly. I then saved it on a memory stick and put that in the Mac and the text then transferred onto the mac pages I was working on and was fully editable.
(I still wonder what went wrong in the first place?)
(I still wonder what went wrong in the first place?)