How can a member have 100% positive feedback when some of the comments are definitely negative

[hpenman-uk]

I have recently sold an item on ebay, I check out the buyers to see if they are good ebayers, and this particular ebayer had 100% positive feedback( didnt go into the feedback in detail just the update screen)

Unfortunatey I am having issues with them, which was a surprise due to their unblemished record, but when I opened up their feedback I found that whilst they have all green when you read them, there are several that are definitely negative feedback but they have a green + next to them... how is that possible? This gave me an skewed impression of this member. I am not happy because now I have issues with this person and if I had known, I might not have concluded the sale. 

[john1297576]

Just shows that some sellers are more intent on breaking the rules than recovering the selling fee.

If an unpaid case is completed NO FEEDBACK can be left , so obviously they like to pay fees for not being paid.

If the buyer asked ebay would have removed the comments and the SELLERS would have Policy Violations on their records, but why should the buyer bother, they have had their POSITIVE score increased and can continue ruining other sellers sales.