problem with the "thanks" button

I was posting today and clicked the "thanks" button. My name would show up along the others that had "thanked" the poster.

Now, a few hours later, I went to "thank" a persons post and the (thanks) button disappeared after I clicked it but my name did not show up and those that had previously thanked the person, their name disappeared also. When I hit refresh, the thanks button came back, the names of the others that had thanked the post reappearedd but my name still isn't there.

Any ideas? Anyone else having this problem?