It looks like you're using a Page Properties Report to generate that table. The Page Properties Report just provides a faithful report of the the data in your Page Properties macros, so if the decimal is in there it'll be displayed in the Page Properties report.
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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