When you search for multiple events (e.g. clicked x AND visited page AND etc.) and those events occur in separate sessions, the results will display a clip rather than a single session. The clip will contain short vignettes of time surrounding the searched event where you'll see a few seconds before and a few seconds after each matching event.
The clapboard icon in the session playlist view indicates a clip instead of a single session.
When you're watching a clip, you'll notice breaks in the session playback line. These breaks indicate a 'time warp' within the playback, wherein the playback is transitioning from a matching event in one session to the next matching event and session.
Don't worry, you still have the ability to view the entire session. You can choose to scrub through the playback timeline or use the event list filter to jump to the event you're most interested in.