I have a matching question, that works correctly on some computers but not all. It is supposed to click left side first to match the right side. When it doesn’t work the left side doesn’t seem to be selected the right side seems to be. Does anyone know what is causing this to behave this way only on some computers?
Wild guess, really, but check the browser zoom setting and the screen resolution. We’ve seen drag-and-drop issues when any modern browser is zoomed in “too far”, and what “too far” is varies from browser to browser. We’ve also seen them on large monitors with screen resolutions north of 1920×1080.