I have already found all 20 chests, the only problem is that Venus and the Moon say 4/5. I have ran though both plants numerous of times to double check my work and I am not missing any. I am using my Main Warlock to find all of the chests, and I have never deleted the character. I even restarted my PS4 and ran though the locations. I found all the chests using the link I attached to this post. I have also contacted Bungie's Twitter help and they have not contacted me. Is this happening to anyone else? https://www.youtube.com/user/DattoDoesDestiny
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Try that link Guardian, should help you out quite a bit.