Hi @Edgaras,
The offset by hours might mean that you have not applied the correct timezone offset in the Javascript code. Note that you might not see time in the Jira Server timezone once you filter issues in Jira if you have set the timezone in the user profile settings in Jira.
Please, check this link for more details: Issues with different update date
We need more details to check the reasons for missing issues. Please, apply to the support by providing the eazyBI Javascript custom field settings, report definition, and the filter by which you counted the issues in Jira.
Kindly,
Janis, eazyBI support