Steps to recreate:
1. Set a hex grid in MapTools 1.2 to 40.
2. Place a token on the grid.
3. Drag token 3 hexes to the Southwest without releasing.
Instead of path being 3 hexes directly to the southwest, the blue path is drawn by extending to the NW, SW, S, then SW, for 4 hexes total. The distance is also shown as 20 instead of the correct 15. This only happens by dragging to the SW and has been reliably duplicated.
See attached screenshot.