Upon separation of your hand, your glove arm is almost toward the target. This is a common mistake that I seem to identify upon inexperienced pitchers. When you separate your hands, you want your arm to be at least a 45-degree angle. Fortunately, there is a very simple drill to fix this habit and it can be done right in your home.
What you want to do is stand maybe 6 or 7 inches away from a wall, with the right side of your body facing the wall. Go through your delivery and change the angle that your arm separates in such a way that your throwing arm will not hit the wall. The purpose of this drill is to force your arm to separate in that 45-degree angle that I mentioned earlier.
Sorry for the poor wording. I’ll make a video going through this drill if you want me to.
Also posting a side view of your bullpen session would help out a lot.