@somannak This is knows issue in Anbox. Best way to fix is simply to pull down the scopes (app list) to refresh the screen. This will remove the duplicate apps.
However, note that Anbox is not maintained anymore and doesn't run well...
I strongly advise you to install WayDroid instead, (www.waydro.id) at least if your device is ported to Halium 9 or higher.