First post is not centered but second post is

[psyhyatr]

Hello guys, I have a very weird problem, it seems like the first post on the topic (the topic creator) is not centered while using the center code but the second post is centered with the exact same message, I took a picture:

First post:



Second post:


You can see the differences between them, what's the problem here, I want the first post to be as the second one.
Thanks for your time.