It’s because of the adjective order. You grow up hearing everyone else use the same common adjective order. In this case it should be size shape color than condition.

Overall it would be opinion size, age shape, color, origin material purpose.

Because everyone uses that same adjective order as a child. You picked up on that so consciously and then adopted that style. There’s nothing that actually prevents you from mixing that up. There’s no rule or some sort of quirk of English that will break if you change that order.

You’re just not used to any other way so it sounds weird.

But changing that order won’t create any sort of confusion or loss of understanding. It’ll just make you have to actively think about something thus slowing you down. We’re doing it the way that everyone does it subconsciously is faster because you don’t have to actively think of it.

So by default you will always choose the fastest way to communicate. Because that’s going to require the least amount of thought for both yourself and the other party.

But again there is no reason you can’t change it.

The only real issue I can think of is if you do change it on purpose it would create an emphasis because you’re breaking a normality. Cuz people just subconsciously assume you go from subjective to objective when it comes to adjectives.

And changes to the standard stand out and thus create points of interest. But again, even that is still not a hard syntax rule.

English doesn’t really have a lot of hard rules. You can f*** with it real hard and it won’t break. Though you may sound very funny!.