broken top stats

Hello, 
I've noticed that top now is now unreliable in measuring system
performance.

[timon_at_timon timon]$ uname -mv
FreeBSD 5.2-CURRENT #19: Sat Mar 13 16:27:48 MSK 2004    
root_at_timon.nist:/usr/obj/usr/src/sys/TIMON  i386

options SCHED_ULE
(cvsupped just before rebuilding kernel & world)

top gives weird CPU/WCPU usage: only first (rarely, first couple) of
processes displayed have non-zero CPU/WCPU usage, all others have zero
cpu usage, but totals, shown in second line of top output differs from
sum of values in CPU column alot. Same with ps.
E.g.: 

51 processes:  2 running, 49 sleeping
CPU: 20.2% user,  0.0% nice,  3.5% system,  2.3% interrupt, 74.0% idle
Mem: 168M Active, 141M Inact, 98M Wired, 716K Cache, 60M Buf, 91M Free
Swap: 231M Total, 231M Free

  PID USERNAME PRI NICE   SIZE    RES STATE    TIME   WCPU    CPU CMD
 1363 timon     77    0 49544K 42140K RUN      1:11  6.25%  6.25% mozill
  890 timon     77    0   100M 83152K select   1:21  3.12%  3.12% XFree8
 1344 timon     20    0 16184K 13144K kserel   1:55  0.00%  0.00% xmms
  918 timon     20    0 78616K 50344K kserel   0:44  0.00%  0.00% evolut
  901 timon     76    0  5556K  2604K select   0:25  0.00%  0.00% wmusic
  919 timon     20    0 41304K 37836K kserel   0:21  0.00%  0.00% pan
  900 timon      8    0  2196K  1616K nanslp   0:06  0.00%  0.00% wmWeat
  899 timon      8    0  2196K  1616K nanslp   0:06  0.00%  0.00% wmWeat
  895 timon     76    0  6552K  5872K select   0:05  0.00%  0.00% wmaker