Or HaChaim on Exodus 37:25/אור החיים על שמות ל״ז:כ״ה

1 ויעש את מזבח הקטורת, he constructed the altar for incense. The reason that the construction of the golden altar is mentioned here is because it was situated inside the Sanctuary as opposed to the copper altar mentioned afterwards. I have explained the reason why its construction had been commanded after G'd commanded the construction of the copper altar (compare 27,1 and 30,1 respectively) in my commentary on וכן תעשו.