AD725 colour problem


We are using AD725 IC to get PAL composite video output. The input to AD725 is RGB (576i) interlaced output from ADV7123 IC generated from FPGA. We are seeing color problem and flickering on the composite output. Attached are the snapshots of the display. Image1 shows original image and image2 shows the output of AD725. We have followed the schematics provided for evaluation board. Luma Trap Circuit for PAL video is maintained as per datasheet. (L=68uH, C=18pF). Please suggest any solution to color problem and flickering issue