I've noticed similar behavior with our Solr cloud cluster for a while, it's random though. We've 2 shards with 3 replicas each. At times, I've observed that the same query on refresh will fetch different results (numFound) as well as the content. The only way to mitigate is to refresh the index with the documents till the nodes are in sync. I always use SolrJ which talks to Solr through zookeeper, even with that it seemed to be unavoidable at times. We are committing every 10 mins. I'm pretty much sure there's a minor glitch which creates a sync issue at times.
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