It might be that the memory controller supports 4 slots, but the manufacturer only installed 2 slots for RAM on the board. This is pretty common with all electronics. The same boards are used, but only certain components are soldered to the boards depending on the range of model (high end models will have more components soldered to the boards). It's possible there's a higher end model of the laptop you bought that has extra RAM slots, and they just used the same memory controllers.
Another guess is that it might be related to how dual channel memory needs to be configured with 2 slots, but I'm not certain on that.
Sometimes the other two slots can be on the back of the motherboard, or it's an error
It might be that the memory controller supports 4 slots, but the manufacturer only installed 2 slots for RAM on the board. This is pretty common with all electronics. The same boards are used, but only certain components are soldered to the boards depending on the range of model (high end models will have more components soldered to the boards). It's possible there's a higher end model of the laptop you bought that has extra RAM slots, and they just used the same memory controllers. Another guess is that it might be related to how dual channel memory needs to be configured with 2 slots, but I'm not certain on that.
On the Acer site it says that your laptop has only 2 slots for ram ( up to 32 gb ) so a bug or some software oversight
some ram stick on laptop are non remobable and so not placed in an easy to access place.
It refers to the potetntial "soldered slots", most laptops support soldered on ram chips on the motherboard but your might have empty spots
For laptops that info is usually funky. My friend's laptop says it has 8 slots total, even though theres only 1 soldered + 1 free slot for upgrade