Due to the way that live streaming works, a small latency of between 10 and 15 seconds is completely normal. In most cases, there is nothing that we can do to make your live stream more instantaneous than that.
As long as your audio and video are synced to each other, and your video stream isn't stuttering, blurry or pixelated, you don't need to worry about this latency. Your fans will be watching you as normal, and they are aware of the few seconds it takes for their messages to reach you.