Rectangualr Grid bug

When using Rectangular Grid tool , I often have this bug - when I try to transform it with "Free Transform" tool , it happens to have 2 points : 1 point anchor , and second point is few inches away from anchor . I don't get it , really .
But sometimes it works fine and I only have 1 anchor that I can align perfectly to my needs . 
Please , help me find the fix to this annoying bug that I've been trying to live with for about 2 years ..