I solved my problem!
I am actually quite newbie in burning softwares but I’ll share what I did.
=>My problem was: The titles in my dvd menu were not in the correct order. What it was said to be movie 3 was actually 4 and so on.
=>Solution I found:
I opened the dvd on DVDSHRINK and with the “Full Disc” option selected I made a backup of it to my hard disc.
Then, to make the wrong order correct I switched some names manually in the folder where I did the backup. What I mean is, if the menu thinks that movie 3 is 4 and movie 4 is 3 I just need to switch their names right?
After that, I opend the folder where I changed the names myself on DVDSHRING and made an image with it.
Finally I burned the image on Nero.
It worked pretty well to me.
Thanks to harley2ride who told me about DVDSHRING!