If your pool is properly water balanced and has a pH near 7.5 (certainly greater than 7.2), then it is unlikely that the copper pennies will be a problem with either water balance or stains. Remember that the heat exchanger in a gas pool heater is probably copper and water flows through it whenever the pump is running (even when the heater is turned off). Also, consider that many homes use copper water pipes.
Metals will corrode (oxidize) in acidic conditions with the presence of dissolved oxygen though the actual factors are quite complex. Nevertheless, you should probably scoop out the pennies from the pool after your kids have had their fun, mostly for safety and aesthetic reasons.
Too many pennies(say a gallon of them or so) may cause green water if improper water balance but copper is a natural germ killer so no it can only be a benefit unless they get into your pump.
Remember that water is a solvent and can dissolve many things. Even if you have a "perfectly balanced" pool ( and realistically nobody does) those pennies will stain the pool -- they are not solid copper and have a mixture of other elements in them.
the most likely culprite is chemical or biological chlorine uptake. something in your water isn't allowing you to achieve break point chlorination ( the point at which you can measure free chlorine). This could be due to ammonia, sulfur, iron deposits or some other chemical in your sourcewater that is "eating up" your chlorine.
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