Don't draw the object I purchased last turn?

[FortunaStreet]

Hello,

I have played the game three times on BoardgameArena, and there is something I still don't understand:
when I buy an item from the shop, sometimes I draw it on the next turn, sometimes.
From what I understood from the rules, those items are always draw on the next turn, since there are on top of the draw pile:

Prepare the following round:

...

3. Collect all the cards in your playing area, shuffle them then
place them face down under your draw pile.
Note: Items purchased during the round can now be found
above the cards you just shuffled.

Did I miss something?

[nccc]

basically, u only draw 5 cards per turn,so if ur draw deck already have 5 cards, and u bought a card,which would be placed at the BOTTOM of ur draw deck. then next turn u won't draw the card u bought last turn. And the card will be the top card of the draw deck.

[FortunaStreet]

Ah ok, object bought are placed at the bottom of the deck, not the top as I was explained the first time I played the game irl.
That explains everything.