Air escapes from the valve area if it's slightly misaligned or needs tightening up.
This a common issue but isn't anything to be concerned about. It's super easy to sort out as part of your regular SUP maintenance regime, simply follow the steps below:
 
  •     Retrieve your SUP repair kit from your bag and locate the valve tool.
  •     Remove the valve dust cap and loosen the valve using the valve tool.
  •     Fully unscrew and remove the valve.
  •     Check the O ring is in place and that the spring on the pin is functioning.
  •     Check the valve thread for any other obstructions.
  •     Screw the valve back into your SUP hand tight and then finish with the valve