XDS pathetic scoring and updating

XDS credit bureau is such a confused credit bureau. I don't think to they know what they are doing and I hope credit companies don't take their scores seriously. I have been sitting on 637 since last month and this week one of my accounts was paid up and I was expecting my score to increase. Today I see that I am down to 621 but NO negative event has happened since them. I have no enquiry BUT my score is pushed down. What nonsense is this.My name is Brian Nhlonipho Cele ***