I recommend that you contact the pokerstars support and mention what happened to you. They will be able to explain to you if it is a technical failure or not.
hello, for chests there is a certain time to go to other chests, if you fill the chest and then after a while you do not fill the chests, then the chest falls below and you will need to fill it again and go higher, I don’t know exactly how much time is allocated for raising chests can maybe two or more days!
when I had enough money to play cash games. I played and opened at least one chest a day for 3 weeks and I never had the opportunity to open a blue chest.