Because you have told it to show 0 decimal places on the scale. You probably want that to be 2. It will get a bit crowded though, you might be bettter to show micro watts, with a range of 0 to 100.
That is an incredibly small power, what are you measuring?
In order to avoid confusion, it might be better to mention in the thread title that you are using the classic gauge, and in the text that it is @colinl/node-red-dashboard-2-ui-gauge-classic.
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