Big black bloches after export

[adam24]

So after exporting my video in bright spots eg. the sky there seems to be black blotches. i'm not sure what it exactly is or how to fix it but it only appears after exporting. May I also add i'm a noob and this is my first time editing footage. Any ideas on what I can do?

[Ann Bens]

Please post screenshot of export settings with left tab open to output and with an image.

[adam24]

I would have posted a screenshot but for some weird reason when i go to click "insert image" nothing happens...

[Jim_Simon]

Try using a different browser.