Is there a bias against mentioning your name on presentation slides? Is there some sort of unwritten rule in academia that you shouldn't mention your own name explicitly on presentation slides? I have seen this time and time again, if you cite work in the middle of the talk and it happens to be your own work, people abbreviate their names. For example, they only write their first name. 'Miller' is abbreviated to 'M.', but all other names are spelled out in full.
There is nothing wrong with mentioning your own name in full in citations on your own slides, and nobody would think anything of it if you did. However, there are a number of reasons why people do this.

Replacing your own name with initials is a subtle way of emphasizing that it is your work that is being cited. You can think of it as a “humblebrag”.
Since you are usually talking about your own work, you end up citing yourself a lot. Replacing your name with initials simply saves space, especially if you have a long name.