Update from VIP assistance service:
"I confronted IT with this problem because they were telling yesterday, that the transaction 2017-12-18 was delayed due to the backlog. They confirmed now an transaction error so this transaction has to be repeated. I'm still waiting for them to tell me when they are planning to do that."
Now I am missing 21st as well.
18th is on the way now :-)
21st is on the way also. Thank you for the effort Genesis Mining :-)
Looks like they were waiting for the network to get better because transcation fees went down a lot just now.
It looks like a lot of new hashpower joined BTC network.
EDIT: BTC network is slow again. It looks like some hashpower is used only in case of emergency(like backup) because time of blocks mining fluctuate too much sometime.