Primefaces datatable header alignment with scrollbar -

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i'm facing strange behaviour of primefaces (v.5.1) datatable. have datatable srollable=true:

<p:datatable var="_udf" value="#{unitadifornituralist}" scrollheight="350"  livescroll="true" scrollrows="20"      scrollable="true" id="risultati" widgetvar="risultati">

when there lots of items scrollbar shown , header correctly aligned: scroll

when there 5 items scrollbar doesn't appear , header correctly hide gap on right scrollbar: no scroll

the strange thing when have more 5 items not enough show scrollbar. in case header shows gap , it's not aligned: wrong alignment

any ideas? thank you


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