Additionally, on Novak's PCR test from Dec 16th on the website, the test result "NEGATIVE" had been changed to "POSITIVE" sometime around 14h00 on January 10th. Noticed by several people, including myself (took screenshot even myself before and after).

BTW, apparently my IP address has now been blocked accessing to that website :) I get this message now: "Ваша адреса је блокирана 24 сата! Vaša adresa je blokirana 24 sata! Your address is blocked for 24 hours!"