Help ; some missing sales in the facekook ads manage

Hello,
in the advertising manager of my account, since 2 days I notice that there are sales (conversion: purchase) missing in the table of the advertising manager of my campaigns.

For example today I made 4 sales and only 3 are displayed in the table.
Same for yesterday, I made 5 sales and only 3 are displayed. This must distort my campaigns and analyses.
could you please help me?

all my campaigns are on the same pixel and are all parameters in conversion event=purchase.

thank you,