After exporting my video on Premiere Rush CC the first 2 clips went blue

After exporting my video on Premiere Rush CC the first 2 clips have turned flashing blue but the rest of the video is the quality that I wanted. Any suggestions of why this is? The footage is a mix of 4K shot on a Panasonic Lumix GH4 and DJI Phantom 4 drone. The footage at the start thats turned flashing blue was shot on the GH4 but lots of the rest of the edit that isn't flashing blue was also shot on the GH4. I've used Premiere Rush once before and had no issues. The video in question was the second export of the free trial so I now have one left . Any help would be much appreciated