I'm afraid you can't "fix" it, because it's not broken - this is intended functionality. The reports in Confluence give you a faithful rendition of the data they're reporting on, so the only way to avoid having decimal places in the values in your report is not to have decimal places in the values in JIRA that you're reporting on.
(Bear in mind that Confluence is a wiki, it's not a data processing tool like Excel. It's not designed to do numerical operations like rounding, or calculations on data.)
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