Field order problems

Hi there!
I’m working on a project and I’m using both vector files brought into AE from Illustrator and jpg files. As far as I know I don’t have to interpret and set field order for these sort of files as they don’t bear any interlacing information. During ram previews everything works just fine but problems come in when doing the final render. Although I leave the field render off in the “render setting” parameters my movie seems to be taking the “lower filed first” option. When I play it back on tv the odd “comb teeth” lines show up and when opening the new rendered file into AE “lower filed” is also showed in the info palette. I doubled checked the “render settings” and “output module” to make sure I wasn’t doing something silly. Does anyone know what could be possible happening? I appreciate any help!