A person to whom the funds were sent  (And for whom I made this post) said "Everything is OK now"
So my problem is Solved!.
Seems like it was a bug.

A problem of not getting half of funds.

Sent a significant amount yesterday. Mixing - 100% to one wallet.
After 12 hours I've got only one half of the amount.
They gave me Whale Code and Whale Pass to track the status of mixing on their site, but it says there are no such records.
Mixing was started 13 hours ago so 1) money should come to me 2) the information on the website must be available.

Contacted support using website, requested the info Looking forward to getting the answer from them.

ps used a Clearnet address
whalemixer.com

I will let you know after the problem is resolved