PSA: There are VERY FEW actual rules on the swap site. The rules that exist are written down. You will see them clearly when you join the swap site and when you swap, list new items, leave feedback, etc.
Most of what we talk about here on the forum is personal preference or sometimes swapping strategies that are more effective than others. Every few months, some new swappers will mention things to me along the lines of dealing with all the unwritten swap rules is a little overwhelming, etc.
I hope no one feels any unnecessary pressure by swapping. Swapping is really just for fun! We have many people passionate about the topic of subscription boxes on the forum. I am definitely on that list! So I totally understand this. The forum can be extremely helpful to new swappers, but sometimes it gets a little intense as well. This will naturally happen when you have passionate people in one place.
As long as you follow the actual written swap site rules, you are doing just fine. Do not worry!
Different people have different swapping styles. If someone has a different swap style than you, it is okay. Many swaps work out. Many do not. It is really just for fun. There are a lot of swappers out there. If one swap doesn't work out, try again and eventually one will.