Well it looks like you have three plants growing here so naturally there will be a space to fill in.
The reason you want to instal as scrog net is to train your plant to fill the entire canopy and holes. This may take some time for them to grow enough to fill all the gaps. Just keep tucking as they grow through their stretch phase.
Also, now is the time to cut anything below the canopy that is not getting adequate light. This will help with airflows and send more energy to the top canopy.
Hope this helps.