Had same problem on AMD 8310 CPU system running same level/flavor of LINUX.

system: Kernel: 5.4.0-77-generic x86_64 bits: 64 compiler: gcc v: 9.3.0 Desktop: Cinnamon 5.0.4
wm: muffin dm: LightDM Distro: Linux Mint 20.2 Uma base: Ubuntu 20.04 focal
Machine: Type: Desktop System: LENOVO product: 10MQS0AR00 v: ThinkCentre M710q serial: <filter>
Chassis: type: 3 serial: <filter>
Mobo: LENOVO model: 3111 v: SDK0J40697 WIN 3305096307091 serial: <filter>
UEFI [Legacy]: LENOVO v: M1AKT36A date: 04/20/2018
CPU: Topology: Quad Core model: Intel Core i5-6500T bits: 64 type: MCP arch: Skylake-S
rev: 3 L2 cache: 6144 KiB
flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 19999
Speed: 2700 MHz min/max: 800/3100 MHz Core speeds (MHz): 1: 2700 2: 2700 3: 2701
4: 2700
Graphics: Device-1: Intel HD Graphics 530 vendor: Lenovo driver: i915 v: kernel bus ID: 00:02.0
chip ID: 8086:1912
Display: x11 server: X.Org 1.20.9 driver: modesetting unloaded: fbdev,vesa
resolution: 1920x1080~60Hz
OpenGL: renderer: Mesa Intel HD Graphics 530 (SKL GT2) v: 4.6 Mesa 20.2.6
direct render: Yes

I'm sorry, I don't understand.. what is the issue? According to here: https://www.mlcathome.org/mlcathome/results.php?hostid=13483 this machine seems to be completing and getting credit for tasks...

Found my answer in

Credits for new "rand_automata" work units
https://www.mlcathome.org/mlcathome/forum_thread.php?id=92

Original message not worded well, should have said that updates to
totals not increasing as fast per work unit as on my 1st PC even after
allowing for different CPU.

Also determined I am better off ( energy used vs points earned ) not
using my GPU for MLC processing.