If you’re having trouble with notifications not showing or showing the wrong number, it could be because you are playing the same village on two different devices. This can cause the notifications to be "viewed" on one device, and that's why they might not show up (or show differently) on your second device.

Fully shutting down the Clash app on the device that you are not using can help in some cases. However, if you regularly switch between phones and tablets, there is a chance that you will continue to see this issue happening.