Why did the value of the rbx register change unexpectedly in GDB?

I am debugging a program on an x86-64 system Ubuntu 22.04 GDB v10.2 GCC 11.2.0 using GDB and encountered an unexpected behavior. I was inspecting the value of the rbx register and noticed that the value changed from 28 to -5604 without stepping through any new instructions. I am trying to understand what caused this change, as I did not execute any additional steps stepi or similar commands that would modify the register value. The sequence of GDB commands I used is in my gdb.txt file The value of rbx initially read as 28 in decimal format, but after running the x/1wd $rbx command, the value changed to -5604. I haven’t taken any further steps stepi or continue, so I’m unsure what caused the value to change