Cache entity count is more than Database entry count for cart & Stock

We are using the 5.2.0.0 version of hybris. And we are having the huge number of cart object present in the entity cache.The number of total carts in the database are 280398 but the count of carts are around 5 lacs in cache.We are not able to relate how the cache entries can be more than Db entries for carts. We are facing the same issue with Stock models also.