PDIUSB12,non sense Interrupt value

Hi,in my "self made educational board" using a PDIUSB12 and a 9s12e64(HC12 family) i found that sometimes the Irq from the D12 has a value of 0x0003 or

0x00C3. That lowest nibble having value 3 sounds like a nonsense because it means that bit 0(indicating CTRL_OUT_INTERRUPT) and bit 1(indicating CTRL_IN_INTERRUPT)are both set. The connections are good,in fact if i send commands to set oscillator out or soft-connect everything looks working.

Thanks to you all

Diego