Unetched or missed lines in your image is due to lazercut dropping packets of data within the download process. While your changing speeds, powers, scan gaps and other parameters within the software to better achieve the end result and then redownloading these changes . The data will get scrambled and misconfigured resulting in the software automatically dropping packets of data..The software does this in attempt to correct itself and then put back the data in the correct configuration before the download process gets thru.......Sometimes the data dont make it back in time resulting in a missed line...
The solution to this is not to move the material or the lazer head and redownload the CFG and the current of the file and go back over the image again...