Right click on a clip in the sequence, select Field Options...
Then select Always Deinterlace
See if that helps.
If it is an interlacing problem then you can do a batch of clips at once in a Bin.
Select the clips you want to deinterlace
Right click and select Modify > Interpret Footage...
In the pop up box under Field Order select Conform to:
Select No Fields (Progressive Scan)