[AdamsLT]

Your SQL query saves the data for ALL vehicles, that are owned by player named XXX_YYY

Specifically this part:

Code:

WHERE owner = '%s'" ,

Your vehicles need a unique identifier and you need to use that id to save them, not the owner.
I see you already have a column "id" so use it.

Code:

WHERE id = '%i'" ,

And for %i pass the id of the vehicle in the database.
That way only that specific vehicle will be saved.