There are some good pointers here

https://backyardpoultry.iamcountryside.com/feed-health/chickens-eating-eggs-10-ways-to-stop-or-prevent-it/

The positive punishment may prove to be particularly effective; blow out and egg and fill it with mustard. Condition them that eggs taste horrible.

I think you should supply extra protein and calcium in laying hen diet.

I agree with the food adjustment, likely hens are not receiving a balanced meal and I would consider free roaming if possible I quote also avoid overcrowding

It's due to imbalance of feed ingredients particularly salts imbalance of Ca, P, Mg etc. Some associate causes may aggravate the situation.

Try to control management uints like: light intensity , over crowding and freqency of eggs collecting plus balance protien and Ca level in thier diet .

This behavior more often appears for birds in intensive management systems than free-range systems. More likely related to the level of nutrition. Provision of nest box can gradually change such behavior.

Provide enough nest boxes to avoid floor eggs and check nutrition to ensure it meets the dietary requirements of the birds. Also check for sex errors and cull them. Avoid heat stress via provision of ventilation and manage well the litters. There might be many factors contributing to this behavior, hence, go back to basic husbandry and management practices plus feed nutrition, biosecurity measures and housing structure and see what has gone wrong.