Yes, there are MANY errors on that web page! In fact, there may be more errors than correct data.
1. Johan (NOT Johannes) Georg Harter was NOT the son of Andreas Harter and A. Catharina Zahner. His parents are unknown, but these cannot be his - I believe he has been confused with their son, Johannes, who is definitely a different man. I believe Georg immigrated from Germany in 1749.
2. Georg Harter did NOT marry Eva Mikesell. He married Eva Bracker in LeHigh County, PA, 26 Oct 1752.
3. Joh. Georg Harter II - correct information but his wife's correct name was M. Magdalena Kitterman(Mary was her christening name, not her given name) This is important, because Joh. Georg Harter III married Mary Miller. Much confusion has arisen here.
4. Georg II and Magdalena DID have a son named Abraham (1759 - 1857) but he did NOT marry. He was slightly epileptic from his youth, but otherwise vigorous so lived a full life span+.
5. There was an A. Christiana Meixel, but she married Michael Will. Kitterman researchers have not yet uncovered the surname of the Christiana who married Christopher Kitterman.

Beyond that I cannot help you. It is possible that you fit into the family because there are some dead ends in my database, but I have no idea how you might fit and strongly suspect that you belong to a different Harter line. All I can say is that the website you have cited has made a connection that does not exist. (This is true, by the way, of many Ancestry.com pedigrees and they should always be fact checked)