We use FOP to generate pdf reports. A Driver is instantiated to render the pdf, after which the driver is reset. When the same driver is reused to render another pdf, one document is created containing the first and the new pdf. So both reports are appended. So I presume the reset method does not reinitialize the internal datastructures properly.
*** This bug has been marked as a duplicate of 1859 ***
batch transition to closed remaining pre-FOP1.0 resolved bugs