Yeah, well someone probably intentionally changed the position of the levers for some reason then. The down side is that the logical place for the levers to be is on the outside since you are using them when you open the door and want to put something on the back parcel shelf (or a kid in the kinder seat or whatever) and having the seat release levers on the tunnel side isn't convenient for that. I will say though that on more than one car besides mine I see levers that have been destroyed by someone accidentally standing on them or hitting them, breaking the threads that the knob screws onto, etc. So that might be why someone did this.
I have no idea how you switch the sides but I'm sure someone else who is more accomplished at seat repair than I will chime in on this.
Scott
ps - FWIW I think you failed to attach intended photograph. If you want to fix that, go to your post and click "modify", then clicked the "advanced" function to handle attachments and upload the photograph.