Wired compaction stat output

[monsterxx03]

Ardb crashed once, unfortunately, don't have coredump turn on.

After that, I get something wired in info command's compaction stat section:

Level    Files   Size(MB} Score Read(GB}  Rn(GB} Rnp1(GB} Write(GB} Wnew(GB} Moved(GB} W-Amp Rd(MB/s} Wr(MB/s} Comp(sec} Comp(cnt} Avg(sec} KeyIn KeyDrop
----------------------------------------------------------------------------------------------------------------------------------------------------------
  L0      0/0       0.00   0.0      0.0     0.0      0.0       0.6      0.6       0.0   0.0      0.0     48.8        13         9    1.411       0      0
  L1     10/0     445.44   0.9      3.0     0.8      2.3       2.9      0.6       0.0   3.8     50.1     47.7        62         5   12.356   9483K   223K
  L2     87/0    5043.46   1.0      6.7     0.6      6.0       6.1      0.1       0.0   9.5     18.1     16.7       376        10   37.648     88M  1672K
  L3     43/0    2592.15   0.1      1.2     0.1      1.0       1.1      0.0       0.0   7.9      9.5      8.5       128         2   63.892   3315K  2871K
 Sum    140/0    8081.05   0.0     10.9     1.5      9.3      10.7      1.3       0.0  17.7     19.2     18.9       579        26   22.260    100M  4768K
 Int      0/0       0.00   0.0      0.0     0.0      0.0       0.0      0.0       0.0   0.0      0.0      0.0         0         0    0.000       0      0

My total data size is 8GB in disk, with default setting max_bytes_for_level_base is 512MB, max_bytes_for_level_multiplier is 10, so my target size for every level should be L0:L1:L2 512MB: 5GB:50GB. But now I have data in L3 ?