FCPX 10.2.3 has drop frame after exported video

Hai guys,

I'm currently editing a telemovie, the footages are Canon C300 1080i interlace footages.

So after i exported the 1hour24mins telemovie, I realise some parts have this weird drop frames while playing back.

I exported in ProRes 422HQ.

Could it be a Render file thing? Has anybody face this problem before?

Should I delete the render files before I export the telemovie?

The drop frame looks like that.