How to stop player sliding in Web Player?

I had previously published my FPS game with the FPS Controller as a Windows Application and player movement worked just fine. When I went to publish my game through the Web Player, the result was that the WASD keys have the player sliding through the level indefinitely. The arrow keys worked fine, this problem only occurs with the WASD keys. If one presses any of the WASD keys and tries to use the arrow keys, the sliding still continues. I have tried disabling player sliding and changing the input preferences and neither have solved the problem. If anybody could be able to help me that would be much appreciated.