One extra pixel in size

I did create to boxes and two circles/disks, one at 20px/20px size, the other at 16px/16px size. When I do put them one in top of another, they do not align, looks like I do have one extra pixel on a side, what could be the problem?

Hi vikylangelo,

So that I can better understand the problem, could you post your .rp file here? If you’d rather keep the file private, feel free to email that over to support@axure.com. Thanks!