So a couple of big changes for this Indicator.
1) Originally when I built this indicator, it displayed a long string of decimals out to 10 places that filled the entire screen, so I used the math.round() function to round the decimals out to two decimal places. While this worked for the time, if that ATR is small (less than .15 cents or so), it can produce significant round errors. Because precision is more important for an ATR, I recoded the script to only display the first two decimal places, this introduces a more precise number.
2) I changed the default multiplier to 1.5 to be in line with commonly used ATR calculations. They typical multiplier is usually somewhere between 1.5 to 2. But you can set the value to anything you choose.