Pirate treasure hunt reset bug

Ok there is 1 thing regarding treasure hunt. Some times if we do 3 hunts after reset time (00:00), later on during the day we get another 3 sails. 1day it was at 13:00 for me, next day it was at 18:00 for me. So 2 days I had 6 sails a day. while some other days I never get the additional 3 sails..
So is this normal that we sail 6 times a day? if it is.. then why its not reseting every day? for example 00:00 midnight and 12:00 noon
if its normal that we sail only 3 times a day then u need to fix it so we all sail 3 times a day
pls take a look at this

Thanks in advance