What is the question?

Too much food/not enough worms. Take the molded part and flip it so it's not on the surface and be careful when handling it that you don't breath in the spores. What are you using as bedding? What colour is the mold? Add lots of shredded paper on top.

BTW, what's the temp. where the bin is?

Firstly, the temperature is about 75 degrees.

I'm using coir with shredded paper as bedding, mostly coir.

The color of the mold is grey.

Jack: My personal opinion to use coir in a worm bin would be a waste because I have to buy it. I use coir in the mix when potting my plants.

As bedding I only use paper product and leave mold. Also corn husks but I guess this is considered as food. I collect them in summer and store in garbage cans.

I on the other hand do not consider coir a waste as I also use it as part of the mix in plants and part of the mix in bins[factory system]. I would not worry about a little bit of mold , mix it in under and the worms will take care of it. I also mix in some peat , shredded paper , cardboard. If the worms appear healthy I would worry about the small stuff.