I'm a Phd student working in the areas of mathematical physics and biology. It is known that papers in pure and applied mathematics follow alphabetical ordering, and it does not matter if your name shows first or last. However, my supervisor told me that when it comes to particular areas of applied mathematics, such as mathematical physics or mathematical biology, there are as many authors who follow order by contributions as there are of those who follow alphabetical order. Based on these facts, my supervisor has told me that we will follow both approaches in our papers since ordering does not matter in mathematics anyway.
My name is ahead of my supervisor's alphabetically. However, for some papers, my supervisor was first. For other papers, I was first. This resulted in a mixed order in the publications listed on my CV. Does this alter its quality, meaning the recruiter will tend to not value papers in which I was a second author?