Some translations add verses and phrases that are not in the oldest and most reliable available Bible manuscripts. Many modern translations either omit those later additions or acknowledge that those additions lack support from the most authoritative sources. Many of these were added hundreds of years after the Bible author wrote his book.
NTTC John 5:3b-4: Who Took John 5:3b-4 Out of My Bible?
The objective of a textual scholar should be to ascertain the original words that were in the original text. He is like a detective looking for clues and evidence that can be held up in the highest court there is, before the throne of God. His goal is not to please men.