Those numbers are showing you that the audio and video, which were once in sync, are now out of sync, and by how much.
You may have accidentally (or on purpose) displaced the audio and video from their original in sync relationship.
The video clip start timecode is 2:06 frames earlier (minus) than the audio that is associated with it, or to put it another way, the audio clip start timecode is 2:06 later (plus) than the corresponding video clip it was originally synced with.
Unless this is what you want, slip the audio or video to correct this.
MtD