An SL bug or my vehicle code?

Hi ,
Anyone know if there is a SL bug where when you chat while on a tour ride your AV lifts up above the intial pose position, but still remains posed? The Av continues on the ride at this higher position unless you stand and resit, after which it is fine therafter. no matter how much you chat.
My code does it on the first use of chat , but not after you resit in the boat
I have been on other rides that have the same problem.

The ride uses a sit pose in a child prim sending a message after the AV is animated that tells the main script (in the root)to start moving. Movement is acheived with:
targetID = llTarget( destination, range );
llRotLookAt(rotateToPoint(axis, destination), strength, damping);
llMoveToTarget( destination, tau );

thanks,

I suspect it is an animation issue, not a movement one. Is a custom sit animation being used? Is it when anyone types, or only people with some kind of typing animation override? Have you tried repeating the sit animation periodically to see if that fixes the problem?

yes it is a puchased animation, I am not sure if it has done it with others, There are three seperate pose seats available and when my partner and I use it , it can happen with one or the other and once both of us at the same time, but not consistantly, we have turned off the overriders and still does it.
I am not sure what you mean by "Have you tried repeating the sit animation periodically to see if that fixes the problem?" Once seated the main script changes to a "moving state" which no longer references the pose - do you mean adding a llStartAnimation(ANIMATION) in this state?

Thanks Hewee , has given me food for thought as a possibble workaround
tho it seems it is a bug:
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