White worms in the compost bin

Hi there,
I'm new to vermicomposting and I already have a problem.
I found many small white worms and I don't know if it's a problem or not.
I saw during the past days that some flies were getting inside the compost bin from the air holes so I attached a net on the holes and now they can't fly inside anymore. I don't know if it was part of the problem.
Anyone can help me?
Thanks a lot

Looks like the flies laid eggs and you now have some maggots eating the food waste.  Not sure if its a problem for your worms.