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Your LimeSurvey version: LimeSurvey Community Edition Version 6.15.14+250924 
Own server or LimeSurvey hosting: Hosting
Survey theme/template: fruity
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From the Participants page, the summary shows 4,234 Total surveys completed. From the Responses page, however, there are only 4,228 Full responses, 234 Incomplete responses, and 4,462 Total responses. That is, 6 responses were not recorded in the responses table. 

The attached is a screen shot showing that the participant completed the survey on 5/18. However, I was not able to view response details for this participant and no record was found for this participant. 

Has anyone experienced this and found a solution? Thanks.