Water movement problems

Hello,

I have problems loading any of the canal maps from Half Life 2. Every single map whether its a new or saved game, once it loads into the game, i’m stuck always moving in a forward direction and cannot stop my player from doing that. Every time I try and force another direction, it continues to move forward. I can’t stop it and this only happens whenever you start off right in the water so all my canal maps of Half Life 2 don’t work because I cannot stop my guy from moving forward. Does anyone know how to fix this? Please help!