Could be a known issue with the cylinder … that only happens with in Resolve. Exported edition xml to FCPX does not happen to have those lines when sharing master. I´m sorry to say it, but after trying hard to work with BMDR, as it is in some aspects a better tool, with a superb colouring, improved editing, composing and audio all in one ,cons are so important (there are quite a few if you ask me) that I can not work with.