Pending Authorization after withdraw from ATM

hi

by 2 months I notice something odd in my Transaction history : when I withdraw money from ATM s (I use 4 different banks) the transaction is display in Pending Authorization for more then 24H ....and after 1 day and half the transaction is display in Transaction History..... in the past the transaction was in pendiing max 3h...
Why the update last that long?
thank you