Shutdown times logged as reboot times?

[semistandard]

During last few days, when I type last shutdown, my actual shutdown times are not displayed. On the other hand, they are displayed after last reboot. Does anyone know what might cause that and how to fix it?

My machine is working fine other than that.
The only odd thing I've done during last week was installing multiple xcode version (because homebrew was causing problems) and then removing them after 14.1 got released. Could it be related somehow?

 

[semistandard]

After checking logs, I have noticed that some background items (Creative Cloud for example) were crashing. After updating them, the was gone for a while. However, for some reason, shutdown doesn't appear again.
Any clue what can cause that, what can fix that, or what should be checked would be greatly appreciated.