So, how does that old saying go? It's not a bug, it's a feature!!!!!!!
Indeed, beleive it or not, this is actually a feature. In recent buddy drops I added this thing I call 'Movemenct Vectors' designed to help you see what the bot (or a bunch of bots all at once) is actually doing to move itself. What I do is display lines coming out of the edge of the bot for each of the four movement sysvars (.up, ,dn, .sx. .dx). The length of the lines are proportional to the value the bot stored into the respective sysvar that cycle and surprise surprise, they look exactly like a tie to nowhere! The line is the same color as the bot and there can be up to four of them at once, pointing in the four bot-relative movement directions, in the case where the bot stored values into all the four sysvars that cycle.
Note that if the bot stores a negative number into a movement sysvar, the line will point the other way. You can tell, for example, the difference between a bot storing 10 into .up or one storing -10 into .dn by where the line starts. The resulting movement of the bot will be the same in both cases, but in the first case the line will start at the forward edge of the bot and in the latter case, it will start from the back edge and go through the bot.
You can turn the 'feature' off via a menu item on the Robots menu.
Thanks for the bug report. I do appreciate it.