Hi, I have a similar problem as yours. I have three first names, my middle name and of course my last name. For example: Maria Anna May Suarez Flores. My transcript, diploma,passport and records with the state BON all have my complete three first names. When I registered online at the PV website, my three first names can't fit inside the first name box. I was in a dilemma because my passport has all my three first names and even the State BON .
So I emailed the PV customer service, called them, had a live chat with a PV agent too. I also emailed the state BON and they all said the same thing." This will not cause you any problems on your exam day. When you arrive at the test center, we will make sure your VERY FIRST and LAST NAME match exactly with your ATT and your ID/Passport. The names in between your VERY FIRST and VERY LAST NAME are not as important."
So my dilemma is gone. And I hope that it will assure you too. GOD bless us all. :-)