There is currently an issue with the way the game reads multiple partners. It displaying that twice is because it reads and displays all members of the giver/taker groups together. What that would actually mean is that Maple's vagina would be 2 sizes larger than your penis and Chloe's would be 3. Asses are sized differently than vaginas, so that would explain the difference with that. I'm assuming one has a Huge vagina and one has Loose. Is that accurate?
It may be misreading and calculating both together, though I haven't seen that happen in my experience.