Since I do not find any relation to today's date with the change in the trust value of the user wwzsocki - the only explanation I found is that the value of trust is not constantly updated, but this process takes place every certain period of time (or on a particular day of the month).
So if someone receives a trust feedback - his score is refreshed immediately, but if he does not get another - the next refreshment takes place in accordance with the planned schedule - or on a specific day of the month (for example the last day of the month - it would explain todays change).

Is it possible? - I have not found information on this subject except for the one below (but it concerns DT1) ...