I've seen this before. It's usually caused by torquing the string and/or the bow enough that the limbs twist at full draw and dump the string. If the limbs are not twisted at brace height now, they soon will be if this is continued. To avoid this, consciously rotate your string hand in a clockwise direction (RH shooter) before you start your draw until you can feel pressure against your ring finger from the string, and try to maintain this orientation during the draw. Hold the bow very loosely in your bow hand, gripping only with your thumb and index finger. Sight down the bow every time you string it from each end. If either end is twisted, twist it back in the opposite direction until it is straight. It will probably stay straight as long as it's not torqued or strung incorrectly.