Have you stored your bags standing up or lying down? Anything in the bag as it is stored?
My thought is that it can start to slouch do to being stored standing up due to heavy handle etc.i have read that for example a Kelly or Birkin by Hermes should always be stored lying down. With some paper in it (cant remember the english name of the type of paper).
Another thought is that the bag is designed to be handheld or used with a shoulder strap and that leather after a while softens.
And the base of the bag is quite small campares to the height of the bag, so it can be physics...
Maybe you should contact
Fendi and ask for their opinion in the matter? Is that normal ”behaviour” after some use or should the bag always stand up when put on a table or similar without anything in it?
If it is something that is wrong then they should help you out, if not, then you know.
I will some day buy a Peekaboo but today i have a belt bag and cabas phantom from Celine. One is really rigid and hard and the leater is not soft, i would have to treat that bag really bad for it to start to slouch, the other one is soft, and its a bag that is deep. I know the sides one day will start to slouch/fall down if there is nothing in the bag due to the leather getting softer by use.
So to sum up, i think (in mumien opinion) with any bag you have to think about:
How do i store it?
How is the leather, soft or hard?
How is the construction/design and proportions?
How Do i use it/treat the bag?
I have for example seen Mulberry Bayswaters. Those bags are quite sturdy and stand up on their own in store. But when that bag with quite thick sturdy leather gets used it starts to loose it and after a while it cant stand on its own anymore.
Good luck! I think checking the issue with
Fendi could be a good Idea, Maybe its something wrong with the bags?