An issue with Orange Pi Zero's CPU clock speed

Soo, few weeks ago, I left the Orange Pi Zero unpowered. Then, now, after I power it on, I quickly ran the 'update' and 'upgrade' commands to upgrade my system... Well, then I ran 'armbianmonitor -m' to check my CPU's temperature and to see if I had installed the cooling fan correctly. Suddenly, I noticed its clock speed is no longer 1200Mhz maximum. I was freaked out then, so I quickly checked the CPU's lowest and highest clock speed using 'cpufreq', and it said that the maximum speed is 1008Mhz (About 1,008ghz), and the minimum speed is 120Mhz (About 0,12ghz). I don't understand why :v I only left it unpowered for a few weeks and now its clock speed just got decreased for no reasons (At least with my thoughts). So, do you have any workarounds for this problem (Like restoring its clock speed to the original, 1.2Ghz)? Any help would be appreciated!

(And it's currently running Armbian 5.73 with the kernel version being '4.19.20-sunxi')

Something like this:

Edited March 25, 20197 yr by Quang-vip
Added a screenshot of armbianmonitor