Today, out of the blue my supervisor came to me and asked me to talk in private. I noticed he had a sticky note on his hand, it was my new phone number I had written down and had pasted to the board of other new mobile numbers from employees.
He told me that he had felt I was overstepping my boundaries, as an employee below him. To my surprise, where I thought I had posted my new phone number (a place where ALL employees could share their new updated contact number) was ACTUALLY where only the branch supervisors put their phone numbers. He believed I was trying to butt up and was trying to be like a person in a position higher than where I am currently.
He also brought up that I started to include our firm's name in the signature of my e-mails. He told me that both of these, from his perspective looked like I was overstepping my boundaries. Of course I did my best to make it clear to him that it was not my intention, and simply I explained the truth that I was just trying to give a proper flush format to my e-mails as an employee. And explained the phone number situation was a misunderstanding.
He also brought to my attention that there were other occurrences where he received that feeling but did not bring anything up specifically.
I feel as if he still believes I took those actions intentionally to overstep those boundaries, how do I make it up to him? Am I actually overstepping boundaries unintentionally? I don't know how to handle this situation.
I work in the United States in California. Originally I am from Vietnam, I don't know if I had violated some sort of custom.