This is likely because your OEM App uses a different device panel from that of the all-in-one App. Your OEM App uses a private panel generated by studio, which does not support DP query. Therefore, when you enter the device panel, it does not refresh immediately. The all-in-one App uses the all-in-one panel, which supports DP query. Therefore, when you enter the device panel of the all-in-one App, it queries the values of device DPs immediately and refreshes the panel after the results are obtained. To support DP query in an OEM App, we recommend that you replace the panel bound to the product on the IoT platform with an all-in-one panel.