I use dolphin in split view mode. Assume to copy some files from one side to the other and do something like rename them with F2 and deselect the selected files at the target side. Now, again copy some other files to the same target side and switch the focus to the target side. Not only the new files are selected, but the previous copied files are also selected too! I use the multi rename function F2 for the new files and by accident I also rename the previous renamed files too. I guess after deselecting files at the target side, there is some variable forgotten to be reset because it still remembers previous selected files, which causes problems by accident.