Perhaps a little diagram of your part profile and your toolpath would help us understand your problem better.
If you were to actually draw a toolpath around a square, it would have to be offset by the radius of the tool. So if the corner of the square is at X0Y0, then the tool cannot begin there because it gouges the part. So it must be offset.
There may be several different types of operations you can create in Solidcam (I don't have the program) but you might have chosen the incorrect type of operation for your situation. For example, you might have selected some sort of 'cut chain' operation, but that is usually meant for engraving type work where you do not care that the tool is cutting on both sides of the path.
A profiling operation would be more suitable where you have to maintain a dimension on one side of the tool. For this type of operation, you need to visualize that the tool must be offset and allow for it with your fixturing.