Why do I have different National ideas for my Roman Empire?

Question

According to the EU4 wiki I should expect the following National ideas:

But when I loaded up the game I found the following:

I understand that I should have the seven going from "Pax Romana" till "Imperium Sine Fine", but apparently I got the ideas of Bali.

Also, wiki states that:

If the average technological advances in the entire realm passes a certain point, the Empire's technology group will be Western instead of Eastern after transfer to EU4.

and I was quite surprised to find out that I was in the Muslim group:

Has the above ever happened to anyone else? What are the conditions that made this happen?

The following disclaimers apply:

• it was not an ironman game
• it was actually quite an heavy-console game played for fun and giggles (the roman empire controls all the available world in CK2 by year 1000, everyone is orthodox and italian, all provinces have maxed tech)
• I converted before the endgame date
• I converted before most of the territories got included as de-jure

Answer 1

After much searching around, I finally found a (partial) answer:

The empire was assigned the tag Z00 instead of the standard ROM, by reassigning the ideas in the "!_roman_ideas.txt" file to the Z00 tag (as suggested on the paradox forums) solved the issue.

I still do not get why this tag problem, but I suspect it has to do with me renaming the empire to "Imperium Romanun" at the beginning.