According to my knowledge, he WAS the 4th.
You are correct. Sometimes when people merge in yet another copy of this tree, this gets changed by mistake. I see that you fixed it. יישר כח.
If you see mistakes in the tree please send me a direct message, and I will fix it as soon as I can.
Please read the description of the following project. It will make things a lot clearer.
https://www.geni.com/projects/Biblical-Tree/38