On the quest description for the Rangers from Risa it says to have only "Lisa" as your partner not Risa.

Old Topic from technical Issues: https://forum.pso2.com/topic/1137/translation-error-risa-lisa

"R" sound is really like an "r+l" sound in Japanese anyway yes?

Yep, there is such an error in this game, I sent the report to tech support about 14 days ago, and thought it was fixed a long time ago.