Yeah that should be update version, so you were on something previous to 2.4.5p1? And it updated to that? Were you on 2.4.4p3?
You have not provided an abundance of information here..
What did it actually update, if it updated packages without upgrading the base version you could have some issues.
2.4.5_1 is not current.. But is supported still, if you would like to stay on that version.. And you have it set in your upgrade settings to stay on that version.. You should be fine.