Friends charge money for drinks and food whenever I'm invited

Hello everyone. This is my first post and I hope I'm not breaking any rules. I'm not a native speaker, so please excuse my mistakes.
I (F28) have two colleagues (F30, M32) who became good friends over the past 3 years that I've known them. Both of them and their significant others as well as my partner and me occasionally meet up for game night. Usually this is at our place, since it's in the middle of the other couples' homes. Whenever it is at our place, we provide all the drinks and snacks. We don't mind that, we like having people around and never thought anything of it. However, whenever we are invited to either of the others, unless it's a birthday, they bring out the bill to split for the drinks and the food they bought. I normally bring something to those events, for example dessert for everyone, however I'm still paying for the expenses of the hosts.
I'm getting really frustrated about this. I feel like we're all adults now, we all work and make decent money and if you invite someone, you should not charge them. If it were always at the same person's home, I would get the idea, but I think if you take turns inviting each other, it always ends up sort of even. We have not once charged them and we have been at our place the most.
I do not want to start charging them money when we meet at our place, that's not an option for me. However, I would like to approach this somehow, since it makes me uncomfortable.
Does anyone have any advice on how to phrase that I no longer want to pay for food and drinks when I'm invited? I don't want to make too big of a deal of it because those are people that I otherwise like a lot and also work with. Or am I being unreasonable and this practice is more common than I know?
TL;DR How can I nicely tell my friends that I don't like the idea to split the bill, when we spend time at their houses?


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