If you have your cursor more than 15 meters away, the relocate spell teleports you 6-7 meters but shows the indication of 15 meters and instead of teleporting 15 meters. if you have your cursor at exactly 15 meters or less, the relocate spell is not 100% accurate. also your character stops running a lot of the times if you're holding down run and relocate.
@Denyde I think this might be an intentional game mechanic that raises the skill ceiling by rewarding percise movement and clicks. And even if it's not intentional right now I think it would be a great addition to the game that makes player's mechanical skill level more meaningful.
That would be one area for leveling that skill, the higher the skill level the more accurate the teleport.