Playtamin's prizes guide is currently down. I've pinged their admin and I'll let you know if I get any info from them.
Btw, this is not a "bug", and this topic will likely get moved to Tavern at some point.
Level 51---343220
Level 50---313470
Level 49---291960
Level 48---278320
Level 47---261620-
Level 46---243180-243510
Level 45---227240-229620
Level 44---208070-213090
Level 43---194400-202310
Level 42---176180-188600
Level 41---162540-174710
Level 40---150000-158550
Level 39---138870-148180
Level 38---128780-137320
Level 37---116480-126730
Level 36---106670-115700
Level 35---100340-105190
Level 34----90450-96510
Level 33----82580-87200
Level 32----73600-79800
Level 31----65830-72580
Level 30----59250-65340
Level 29----53030-59040
Level 28----47400-52980
Level 27----42120-47110
Level 26----37470-42040
Level 25----32910-37230
Lecel 24----28880-32850
Level 23----25620-28760
Level 22----21910-25500
Level 21--- 19010-21720
Level 20----16110-18690
Level 19----13670-15960
Level 18----11580-13,590
Level 17----10230-11070
Level 16----7860-9,360
Level 15----6450-7620
Level 14----5370-6,000
Level 13----4230-5,000
Level 12----3180-3,750
Level 11----2490-3090
Level 10----1890-2380
Level 9----1350-1830
Level 8----910-1380
Level 7----660-900
Level 6----450-610
Level 5----280-420
Level 4----180-270
Level 3----130-180
Level 2----90-120
Level 1----90-100
It's not complete but it will get you started. I've built this one myself based upon the prize ranking number given to prizes I've conquered in one hit.