okay I'll try to be more specific.
The problem as Shirtmaven has already said is too much taper.
It might feel as if you have enough room if you are standing still with your arms at your sides. However when you raise your arms the shirt body will rise up as well--there is no way to completely eliminate this, regardless of armhole size or how the sleeves are attached to the body. If the shirt is too closely contoured to the body and there is too much taper, the waist of the shirt will rise up to the chest and the cloth will get 'stuck' there because there is insufficient ease. When the arms come back down the shirt body will not come back down and then you get those horizontal lines.
Please please please do not start more threads with "how do I fix this" until you address this issue.