Trouble buiding a Harpie Deck

Tonight, I tried to build a Harpie deck with Cyber Harpie, Harpie Ladies 1, 2, and 3, but it would only allow the three ladies. Why is that?

Only three Harpies per deck.
So, you could have...
3 HL 1
-OR-
2 HL 1
1 HL 2
-OR-
1 HL 1
1 HL 2
1 HL 3
et cetera.

That is weird because I thought when building a deck that I could have unless on the list up to three copies of a card with the same title.

Cyber Harpie, Harpie Lady 1, 2, 3... all count as "Harpie Lady". Cyber Harpie even says so.

You can only have up to 3 of one name. "Harpie Lady" is one name; that is why you can only have 3 of all those combined.

bcs every harpie is treated as harpie lady , and you can't put more than 3 monsters with same name in a deck