Thank you for your question.
It is very possible that the judgment increased. There are two ways this can legally happened. First of all depending on the state there is a 10-12% interest levied on the debt, and in the case of Mississippi if that is where the case originated, the judge is free to set a "reasonable" interest rate as he sees fit. Therefore you would need to find out what the interest is, and if it was about 10%, then the amount it grew by is about right (since interest becomes part of the principal and then is also subsequently charged interest). The other way this legally can take place is if the other side was actively trying to find you, place a lien, or seek out a judgment, all those fees and costs are added to your judgment since they were incurred while reasonably trying to pay the debt.
Here is the Mississippi law below:
SEC. 75-17-7. Interest on judgments and decrees.
All judgments or decrees founded on any sale or contract shall bear interest at the same rate as the contract evidencing the debt on which the judgment or decree was rendered. All other judgments or decrees shall bear interest at a per annum rate set by the judge hearing the complaint from a date determined by such judge to be fair but in no event prior to the filing of the complaint.
SOURCES: Codes, Hutchinson's 1848, ch. 47, art. 2 (3), ch. 54, art. 2 (38); 1857, ch. 50, arts. 1, 3, ch. 62, art. 100; 1871, Secs. 1269, 2279, 2281; 1880, Secs. 1141, 1143, 1958; 1892, Sec. 2350; 1906, Sec. 2680; Hemingway's 1917, Sec. 2078; 1930, Sec. 1949; 1942, Sec. 39; Laws, 1975, ch. 336, Sec. 1; 1989, ch. 311, Sec. 5, eff from and after July 1, 1989.