Hello, can anyone tell me why I am getting these markings on my footage. Im using Freewell ND filters on the camera and they seem to be appeaaring in lower light conditions.

Hello there Stucola. I am sorry for the trouble this has caused and thank you for reaching out. I hope that our fellow DJI members who uses Freewell ND filters the can give out there best recommendation with regards to this matter. Just a friendly, reminder that DJI does not recommend you to your 3rd party accessories like ND filters on your DJI products or DJI drones. These 3rd party accessories might affect the said DJI product when in use. Actually, there is a possibility that these 3rd party accessories will be able work. However, since it's not yet optimized and tested by DJI we cannot guaranteed the stability of the said 3rd party accessory if it will work all the time with no issues and might void the warranty of the said DJI product. Thank you.

Are these variable ND filters?

Hi. They are not variable filters, no.
They are ND filters from the Freewell All Day pack.