SolrCloud FunctionQuery inconsistency

[sling]

Hi,
I have a solrcloud with 4 shards. They are running normally.
How is possible that the same function query returns different results? 
And it happens even in the same shard?

However, when sort by "ptime desc", the result is consistent.
The dateDeboost generate the time-weight from ptime, which is multiplied by
the score.

The result is as follows:
{
  "responseHeader":{
    "status":0,
    "QTime":7,
    "params":{
      "fl":"id",
      "shards":"shard3",
      "cache":"false",
      "indent":"true",
      "start":"0",
      "q":"{!boost b=dateDeboost(ptime)}channelid:0082 && (title:\"abc\" ||
dkeys:\"abc\")",
      "wt":"json",
      "rows":"5"}},
  "response":{"numFound":121,"start":0,"maxScore":0.5319116,"docs":[
      {
        "id":"9EORHN5I00824IHR"},
      {
        "id":"9EOPQGOI00824IMP"},
      {
        "id":"9EMATM6900824IHR"},
      {
        "id":"9EJLBOEN00824IHR"},
      {
        "id":"9E6V45IM00824IHR"}]
  }}



{
  "responseHeader":{
    "status":0,
    "QTime":6,
    "params":{
      "fl":"id",
      "shards":"shard3",
      "cache":"false",
      "indent":"true",
      "start":"0",
      "q":"{!boost b=dateDeboost(ptime)}channelid:0082 && (title:\"abc\" ||
dkeys:\"abc\")",
      "wt":"json",
      "rows":"5"}},
  "response":{"numFound":121,"start":0,"maxScore":0.5319117,"docs":[
      {
        "id":"9EOPQGOI00824IMP"},
      {
        "id":"9EORHN5I00824IHR"},
      {
        "id":"9EMATM6900824IHR"},
      {
        "id":"9EJLBOEN00824IHR"},
      {
        "id":"9E1LP3S300824IHR"}]
  }}





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