Thank you, I have updated the screenshots. I'll wait for the parity to finish and will update you.
So Disk 7 and 8 were the disk I was trying to replace. What happened is, that I unplugged disk 5(didn't count the parity drives on the physical server while array was on - Dumb me!) and plugged it back in right away.
Then shut down the array and replaced both 7 and 8. Unraid said it's missing more than 2(Disk 5, 7, 8 ) drives from parity and is unable to fix it. so I replaced back disk 8(original 4tb) with only disk 5, 8 missing I started the parity/rebuild. which did it for Disk 8.
After that, I went on Maintenace mode to do the check for Drive 5. and it was giving me an error.
I shut down the array and removed the drive from the array and started without disk 5. then turned off the array and added disk 5 again and started the parity check.
Btw Disk 5, is the same original disk. it was just unplugged and plugged back in right away. I think it rebuild the array without that disk once, and now it's rebuilding that 8tb(Disk 5) drive again.
Disk 7 is the next disk I want to replace after its fixed.
Once again, Thank you for your help!