It's because you are using the height and width of the object in the code ( the first line. ) Even when the bucket is sideways, you still use x and y coordinates and add random amounts related to it's standing position height and width.
You can give the bucket object an instance variable called "IsStanding" then;
on touched bucket
if bucket is standing
{use the code in the screenshot you shared }
else
{replace the formula: ((TrollySpace.X - TrollySpace.Height /2) + random(trollySpace.Height) , (TrollySpace.Y-TrollySpace.Width/2) + random(TrollySpace.Width))}
I hope I could describe it