Its not odd at all, in my world, and the explanation that you are set up in life makes it fair to me. If you were lacking what they had been guven, Id agree that it seemed a bit off. Not being given something you dont need seems fair enough to me.
My parents paid for my sister's wedding. She was in her early twenti s and just starting to teach. She was also given some kitchen appliances as a wedding present. When I bought my first house, on. My own, they bought me the kitchen appliacnces, saying now would be a good time and since i had declared my intention to never get married, they might as well do it now.
We did get married, when I had just turnd forty and we were both comfortably set up in life. They insisted on paying for the reception and tried top pay for the rerst, too. I was proud to not need it.
They would say that they dient know when they might need their money, so would not make a fuss about equal value presents but expect that things would even out over the time.
I can understand the OP maybe (wrongly) thinking that their approach somehow means that they are not as 'loved' as the child sho was helped more. I'm sure it is t the case at all. And if they were in trouble in future, may even be glad of a handout further down the line. Hope it goes well and they dont need it.