Are you applying the second lut after the first LUT? (Are you putting two luts on 1 clip?…cause that would almost certain over expose everything, and could present itself as a white clip. I typically would apply a LUT at the node tree level as it’s own node, or in the color management section. Honestly never added one directly to the clip in the color timeline, but by doing so, you are allowed to add more than one LUT to a clip, which would (usually) be bad.
Glenn