Masking lines not aligned Pr

Hi, am having a probleme with Pr masks, the masking is not aligned with the masking's line. There's a gap between the masking and the masking's blue lines.The feather is set to 0. The expansion to 0.  For those who are going to tell me to just fix it by decreasing the expansion of the masks, yeah, but it is not precise on complex maskings... Thanx for those who will take time to help me, i have been troubling with this problem for the past weeks.. (ps. Sorry for my english)