У вашего броузера проблема в совместимости с HTML5
Paddy is dead :(
You can instead try Anima's new Padding feature: https://medium.com/sketch-app-sources/introducing-padding-in-sketch-with-anima-d5c884fd9887
Padding can be applied to one 'Background' layer (either a shape layer or a Symbol) of a group. The 'Background' layer will automatically resize itself so that it surrounds all other layers within that group by a specified amount.
Specify the padding amount within the background layer's name between '[' and ']'. e.g. Background [10 20]. The format of the padding values should be in the same order as CSS.