There's no point in installing both WinPcap and npcap, Wireshark will use the latter if present.
You can try the following steps to get a working npcap installation:
Uninstall both Winpcap and npcap
Reboot.
Install the latest npcap version from their site. Uncheck the options for WinPcap compatible mode, legacy loopback adaptor and administrative users only.
