Weird "Work at a pizza script" present behavior

It could just be weird luck but I have done 4 tests (2 on phone and 2 on pc). As I speak I'm still unboxing gifts lmao. It seems that opening presents from the android version of roblox increases your chances of getting more expensive items. I've done 4 tests as I said, I bought 10k worth of presents and looked at the item's rarity and sell price. The value of the gifts opened on my phone is more than double of the gifts I opened on pc. I can't tell if it's just luck or if the random number function that is used for gift rarity or value is based on something that can be manipulated. 

Either way, opening gifts on your phone might give you better results. If someone could make a script to manipulate this it would be rly pogger anyway tnks for reading this loser 

I'm open for opinions from people who actually know what they're talking about <3