You may notice that the weight displayed on your watchface is slightly different from what you see in Garmin Connect. This is due to how Garmin stores weight data internally.
Garmin stores weight values in kilograms with one decimal in the system. When you enter your weight in pounds (lbs), it gets converted to grams and stored. However, this conversion involves rounding, which can cause small discrepancies when the value is converted back for display.
This is a Garmin system limitation - there is nothing that can be done on the watchface side to fix this. The watchface simply displays the weight value that Garmin's system provides after it has been stored and converted in grams.