That clear viscous wetness is evidence of a shell-less egg. You have a hen that needs treatment with a calcium supplement to address it or she may end up suffering an episode of egg binding as eggs without shells are difficult to pass.
Do your best to monitor that box to identify which hen it is if you are able. Remove eggs as they are laid and try to rule out the hens that are laying them. When you discover the hen behind the shell-less eggs, give her a calcium citrate tablet each day until she's producing eggs with normal shells. This is the calcium I recommend as it is quickly absorbed. Get it at Walmart.
People often assume that it's impossible for a hen to lay more than a single egg per day. In a large number of egg binding episodes, two eggs are involved, often one is normal and the other is shell-less. The calcium therapy will also help to regulate the ovulation to avoid these double eggs which increase the danger of egg binding.
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