That's pain... I had this with a share with 71 upvotes once 2 weeks ago...
I am afraid it happens from time to time lately. My theory is that it happens when hiveposh.com is down or freezes (server problems). But I can be wrong.
The reason may also be in the Reddit API.
But there is hope. A year or so ago, I did not receive Redditposh comments from time to time. I was very disappointed. Then the problem disappeared and didn't come back for many months.