The problem is that most messages are genuine, and came indeed from the Ascended Masters, without distortion.
The only explanation I see for this situation is:
1 - Things on Earth are extremely complex and distorted, due the long dominion of darkness on the planet, millions of years.
2 - The Ascended Masters are relatively new in their offices. Most of them ascended 200, 300 years ago.
3 - A dimensional shift doesn´t happen every day. This is the first time it happens to Earth.

A mix of all these factors may explain the present situation. Probably there are other cosmic factors we aren´t aware. The Ascension of Earth is not an isolated event, but part of the Ascension of a whole sector of the Universe. The coordination of this huge event must be a tremendous task, specially because the contamination of darkness in many areas.