but yet vs but yet not

Some examples from the web:

• It is a beautiful, grand and seductive project, but yet it harbours many dangers.
• I see you surrounded by beauty, but yet there's something... dark.
• This is a very modern restaurant but yet very cosy.
• But otherwise had me soo in the great and whole but yet fallen.
• I would like to put before you a thought that is perhaps more general but yet, I am sure, very practical.
• We realize this, and we have done much to repress our violent nature, but yet it still remains within us.
• I've been house
• sitting all summer, but yet I still can't find my way around.

Some examples from the web:

• The place was peaceful but yet not far from the Sistina beach. Perfecty located.
• In certain individuals, they can have autism for a reason that is genetic but yet not because of autism running in the family.
• One line of this activity, lofty and spiritual but yet not the line of the Hierarchy of Splendor and Compassion, is that followed by the Pratyeka Buddhas. Aeons will pass before these Pratyeka Buddhas reawaken to take up anew the evolutionary journey, the evolutionary pilgrimage.
• The house is situated in a most secluded and private position, surrounded by the green and peaceful Umbrian hills with great views across the medieval village of Monte Petriolo, but yet not isolated.
• His salvation was great, but yet it was not redemption.
• We know that one Member States meets all the criteria for membership of EMU, did not enter a condition in the Accession Treaty, but yet does not want to participate.
• But yet I know not how to get the crown... for many lives stand between me and home.
• But miss blair not yet grieve properly.