@safari I added the chinese part because that how it felt to me when I read your post lol.
No worries, you can edit your post to put the english version instead, so future reader won’t have troubles.
Think of the declination as a simple offset between the “true north” and “magnetic north”, so a 1° error in decliation will result in a 1° difference between the true north and magnetic north, so, what you are showing is not an issue with the declination.
Analog compass will only show you the Magnetic north, if you set the Declination offset to 0 on your watch, you should have the same value.
As other mentioned, the compass integrated in watches is pretty sensitive to even simple metal stuff (the spoon in the example is "redirecting " the magnetic field along the spoon axis, thus changing the direction of the field near the watch), so its only really usable in the “wild” and far from other metallic stuff