Left is server, right is client.
Server’s Widget Reflector. There are 2 PlayerCards, but it looks like there are 3. i
Client’ Widget Reflector. It’s OK.
From what I checked by taking logs from the server side, the values were assigned to the variables correctly, except for the UI part. Therefore, the results should be the same as on the client side, but there is an unheard of bug like this.
Solved. Place of implementation change, C++ to BP.