That is not a software issue but - in most cases - codec issue. So first try those steps: Resolution for an issue where green, purple, or pink haze appears in the Source or Program monitors, or the exported fil… If that will not help try to convert any two of your files into good intermediate codec (f. eg. mov/animation, DNxHD, ProRes, cineform) and then try to merge your new files together. Let us know if that helped.
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