The "marks" may be due to a poor quality filter. The kit lens may be doing all it can. Filter or no. Also it may have some smudge on the front element or filter. Try using the supplied hoods with each lens. No filter. DSLRs do not require a UV filter at all. Thye are not film cameras!
I _really_ have a difficult time seeing it in the first image, but clearly see it in the 2nd image (and in the animation).
I wish you had moved the camera to see if the streak follows the sensor vs. the sky. I say this because in the 2nd image (the on in which I can see the streak) the axis appears to be aligned to the brightest point of light (the sun behind the clouds) and this implies that it may be lens flare.