Help! The amount remaining to payout is Increasing!

There is a strange phenomena. I have a one RTX 3070 worker and it used to work fine until last week, meaning that everyday that passed ,my unpaid balance was increasing. Because, of course, my worker was working and mining Ether,
Since last week, it is working reversely. last week,I was in 16% to payout. Today after many days that my worker was mining, I am in 21% to pay out!! In other words, according to hive, not only I did not increase my unpaid Ether,but also decrease it.!
It is really confusing and I do not understand negative advance in unpaid balance.

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