Report details are not displayed

I make a report in Jasper Studio 5.6.0, and imported my generated * .jrxml file into the BonitaSoft, but everything that is put into the "Details" section of the report simply does not appear, however in the preview of jasper studio it appears normally I configured the report thus:

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I have no idea what might be causing this, for example, if I put the content in the "Title" tab everything is displayed correctly.