Single bees grooming before leaving the hive?

[A37]

This is my second year. I installed my packages on comb from a dead out last year. They are really grooming a lot before leaving the landing board and I don't remember them doing that last year. Some do their tongue and some do the back legs excessively. Some bees are also banging their stinger on the landing board, I don't know what that's about. Is this normal? This might be a silly post but I don't have anyone else to ask..  Thanks

[cao]

IMO a clean bee is a good thing.