Squids swim ultrafast

Ive accidentaly found a bug, while playing offline
Squids swim too fast in flowing water with brakes, made using signs

What i expected:
Squids are swimming well

What i got:
Squids are rocket-boosted

Watch video for details: http://www.youtube.com/watch?v=faDRuseP3D4&feature=plcp or in attachments