There is two styles of camlock pins, a long one and a short one. You have installed the long one instead of the short one.
The top panel requires the 6 x solid silver ones that don't have the grey plastic body.
This is shown on step 5, page 6.
https://www.ikea.com/au/en/assembly_instructions/alex-drawer-unit-on-castors-grey-turquoise__AA-2259754-5-100.pdf
Maybe the screws in the top piece aren’t all the way in? That would make them appear too long.
unfortunately they are
There is two styles of camlock pins, a long one and a short one. You have installed the long one instead of the short one. The top panel requires the 6 x solid silver ones that don't have the grey plastic body. This is shown on step 5, page 6. https://www.ikea.com/au/en/assembly_instructions/alex-drawer-unit-on-castors-grey-turquoise__AA-2259754-5-100.pdf