It's probably your tonguing. I'm working on staccato and have similar issues.
If the tongue hits or slaps the reed and stops the vibration too long the airstream/reed take time to start again thus distorting the tone, at least that's what it feels like to me.
If the tongue hits or slaps the reed and stops the vibration too long the airstream/reed take time to start again thus distorting the tone, at least that's what it feels like to me.