As far as I understand from your explanations, your page is tooltipified automatically by the RadToolTipManager. This functionality is turned on by explicit setting AutoTooltipify="true"
for the version you have specified - v. 2009.1.402. However, if you are using an old version, this might happen without setting the property because it used to have default value true which was later changed to false. You can find more information about this fnctionality below:
Straight to your particular question - you can easily determine which exact part of your page to be automatically tooltipified by setting the ToolTipZoneID
property as explained below:
In your case this will reduce the target controls and will solve the problem if this was the reason for it.
Another option is to turn off the autotooltipifing functionality and to manually add the desired targets in the TargetControls collection as demonstrated here:
I hope that the provided explanations and resources are helpful, let me know how it goes.
the Telerik team