EM9191 shows System Mode only occasionally

When I run the !GSTATUS? command on EM9191, the ouput changes. Sometimes it shows System Mode sometimes it doesn’t. What’s the reason?
Example1: showing system mode
!GSTATUS:
Current Time: 7828 Temperature: 51
Modem Mitigate Level: 0 ModemProc Mitigate Level: 0
Reset Counter: 1 Mode: ONLINE
System mode: ENDC PS state:
LTE Rx chan: 1100 LTE Tx chan: 19100
LTE SSC1 state:INACTIVE LTE SSC1 band: B66
LTE SSC1 bw : 10 MHz LTE SSC1 chan: 0

Example2: not showing system mode
!GSTATUS:
Current Time: 2451 Temperature: 50
Modem Mitigate Level: 0 ModemProc Mitigate Level: 0
Reset Counter: 1 Mod Attached
LTE band: B66 LTE bw: 10 MHz
LTE Rx chan: 66586 LTE Tx chan: 132122
LTE SSC1 state:INACTIVE LTE SSC1 band: B2
LTE SSC1 bw : 20 MHz LTE SSC1 chan: 1100

I think your terminal has some problem as I can see missing characterse “Mod Attached”.
Do you test in Windows?