About 1-2 years ago my account had also suffered from this 'bug' but it returned to normal in about a month. That time the payout would have decreased by a quarter or a half.
And yes, I've deposited some 50000 satoshis to the site few days ago, and with the 10k satoshi I've collected since my last withdrawal, I've got 60k now and received few satoshis per day from daily interest.
I've signed up since 2014, and have changed my ISP during these years. My ISP gave me the same IP address for a year until few months ago they gave me another. But monthes after the IP change, my payout don't decrease until today. Maybe they've run a code that affects users with their IP addresses changed from signup.
If any admin can help me to solve this, my ID is 554871.