Hi
Yes...It looks like you simply added the audio file to the existing audio track...i.e. Audio Track1.
If your video clip on Video Track 1 has audio associated with it on Audio Track 1, then adding another audio file at some mid point by dragging and dropping, or adding it to the cursor position if this is at some mid point, will cause VP will split the video clip and insert your new audio into split on Audio Track 1, thus creating a gap in the video.
You need to drag and drop it onto Audio Track 2. This is situated immediately BELOW Audio Track 1.
Nat