TOP n sometimes gives wrong number of lines (SSRS 2008 SP1)

Question

Hello all,
a workmate has created a dashboard report which contains (among other items) a top n chart item. The user can select the value of n using a report parameter. We have observered that for some values of n and specific values of the other parameters the chart shows the wrong number of lines (bars), e.g. I choose to select TOP 5, but the chart shows in some cases the TOP 6.
Is such a behaviour already known?
I will try to create a minimal sample for reproducing this behaviour during the next few days.
Thanks in advance and best regards,
Gerald

Answer 1

Hi Jerry, I already tried this but for some reosan when i add the second filter data mismatches, I have used sort on $$ which is a requirement in my case.
Data with one filter($$) and Sort on ($$):
NBR
Desc
QTY
$$
Perc
67
MG
MIS
105
$7,197.44
64.02%
67
BR
BRO
21
$1,439.49
12.80%
67
CH
CHI
10
$685.47
6.10%
67
CR
CRA
7
$479.83
4.27%
67
LT
LSE 
5
$342.74
3.05%
67
CF
FINISH
4
$274.19
2.44%
67
PW
PACKED
3
$205.64
1.83%
67
BL
BLIS
2
$137.09
1.22%
67
DN
DENT
2
$137.09
1.22%
67
CL
CLOU
1
$68.55
0.61%
67
CP
PURCHASE
1
$68.55
0.61%
67
IC
CONSTRUCTION
1
$68.55
0.61%
67
SH
SCRA
1
$68.55
0.61%
67
SS
SPLIT
1
$68.55
0.61%
Data when second filter($$ and Desc) added
NBR
Desc
QTY
$$
Perc
67
MG
MIS
105
$7,197.44
64.02%
67
CR
CRA
7
$479.83
4.27%
67
LT
LSE
5
$342.74
3.05%
67
PW
PACKED
3
$205.64
1.83%
67
DN
DENT
2
$137.09
1.22%
67
CL
CLOU
1
$68.55
0.61%
67
CP
PURCHASE
1
$68.55
0.61%
67
IC
CONSTRUCTION
1
$68.55
0.61%
67
SH
SCRA
1
$68.55
0.61%
67
SS
SPLIT
1
$68.55
0.61%
It displays only ten rows but you can see some of the rows Bro, Chi are missing(not sorted as above) when second filter is added on Desc column