Do Huawei phone and watch walking steps get double counted?

No.

In order to maximize the number of steps taken by users throughout the day, and taking into account the fact that users may have been wearing only their phone and not their watch for a certain period of time, Sports Health has fused the number of steps taken by the phone and the watch throughout the day.

When it is found that a certain period of time is only wearing a cell phone but not a watch, then the number of steps for that period of time will be counted by the cell phone, so there is a case of inconsistency between the Sports Health APP and the watch.

Expanded information:

Note:

Huawei Watch three circles From top to bottom are the step count, medium to high intensity activity time, and standing count statistics, and the circles are for completion.

Huawei Watch data are done by sensors, if in some scenarios, the shaking is regular and lasts longer, the acceleration sensor data is similar to walking, the wearable device may mistakenly believe that it's walking, and it will also record the number of steps.

If you take only a few steps while walking, and the walking motion doesn't last, the wearer may not record them. If the number of steps on the wearable device suddenly increases, it may be due to the app synchronizing exercise data to the wearable device is turned on, synchronizing exercise data to the wearable device switch is turned on by default.

Baidu Encyclopedia - Huawei Mobile Phones

Baidu Encyclopedia - Huawei Smartwatch

Huawei Official Website - How to View Steps for Running