Children objects has negative co-ordinates in Browserchild

Last year, one web based product has been revamped with our own reporting modules. Lot of javascripts used for this reporting. Silktest is able to identify the HtmlTable and HtmlColumn objects properly. But the co-ordinates are shown wrong. Each click action is done in different point instead of expected point. Only X-Axis position got changed. See the RECT info below.

BrowserChild (Parent) rect: {195, 175, 827, 538}
Htmltable rect: {-77, 323, 818, 574}

It is varying for different kind of reports. Testcases need to do left-mouse click and right-mouse clicks. I have set few variables for position changes. I have written the code like below. In the Runtime, XAxis changes (ixGridInc) are calculated dynamically. I have given the code below:

4Test code - To set the Table position dynamically

 
[-] void SetGridTablePosChanges (Window wTable)
 [ ] // To set xAxis and YAxis increments (changes)
 [ ] // Position changes.
 [ ] Window wParent
 [ ] Boolean bxGetPos = FALSE
 [ ] String sWinTag, sMainFrameTag
 [ ]  
 [ ] RECT rtTblCell = wTable.GetRect (TRUE)
 [ ] Print ("table rect: {rtTblCell}")
 [ ] 
 [-] if (ixGridInc == -1)
  [ ] Print ("Grid xAxis increment is going to set.")
  [ ] ixGridPos = rtTblCell.xPos
  [ ] // iyGridPos = rtTblCell.yPos
  [ ] bxGetPos = TRUE
 [-] else if (ixGridPos != rtTblCell.xPos)
  [ ] bxGetPos = TRUE
  [ ] ixGridPos = rtTblCell.xPos
  [ ] // iyGridPos = rtTblCell.yPos
 [-] else
  [ ] Print ("Already Grid xAxis increment is available.")
 [ ] 
 [-] if (bxGetPos)
  [ ] 
  [ ] sMainFrameTag = WindowTag (wTable)
  [ ] sWinTag = GetField (sMainFrameTag,"[BrowserChild]",3)
  [ ] Print ("Whole Table  tag: {sMainFrameTag}")
  [ ] Print ("Parent tag: {sWinTag}")
  [-] if (MatchStr ("*[6]*",sWinTag) || MatchStr ("*mainFram*",sWinTag))
   [ ] wParent = MyReportPage
   [ ] RECT rtTblCell2 = wParent.GetRect (TRUE)
   [ ] Print ("Parent rect: {rtTblCell2}")
   [ ] 
   [-] if ((rtTblCell.xPos < (rtTblCell2.xPos + XAXIS_TABLE_DIFF)) )
     [ ] ixGridInc = rtTblCell2.xPos - (rtTblCell.xPos) + XAXIS_TABLE_DIFF
     [ ] Print ("X Axis changed Position: {ixGridInc}")
  [-] else
   [ ] Print ("Parent{wParent} is not expected one.")