NFA and temp files on /tmp

Hello Guys,

Seems NFA is creating and NOT deleting a lot of files on my /tmp. I'm seeing a LOT of myChart*png files and sometimes somes pieChart*png and *pdf as well.

[root@correio tmp]# ls *png
myChart11930548412137858.png myChart11931234928818037.png myChart11931738497088252.png myChart11932266930178510.png
myChart11930548826777859.png myChart11931237981998038.png myChart11931741556398263.png myChart11932269971028511.png
myChart11930550120877860.png myChart11931241021188039.png myChart11931744620768274.png myChart11932273139038512.png
myChart11930551106237861.png myChart11931244071848040.png myChart11931747689398284.png myChart11932276936438513.png
myChart11930691175447862.png myChart11931247122938041.png myChart11931750743718294.png myChart11932279989648514.png

[root@correio tmp]# ls | grep pie
pieChart1193480169343.png
pieChart1193480175853.pdf
pieChart1193480175853.png
[root@correio tmp]#

I've copied some to my html area and i can confirm they are NFA generated files.

Shouldnt this files be cleaned after being generated and displayed ??