Sequence settings are 1920x1080 25 frames that is PALHD in widescreen. PAR1.0
Export settings are 720x480 which is NTSC with a PAL framerate and a PAR of 1.0? which should be 1.2
That will defenitly give a bad result.
Dont use Match Source Attrubutes when the output is going to be diffrent then the input.
Use a preset or set everything manually.