Ps5 mouse keyboard binds

I think it might be a bug , on ps5 I'm trying to bind and walk forward to right mouse button but when I try to walk it rapidly stutters between infantry zoom and walk , sometimes if I restart everything it seems to work for a match then goes back to doing it again, it's like the default keybinds are hard coded and conflict with any changes , is there any work around so I can use the keys I want ?