My Printer is saying, some ink tanks are not

If the cartridges are in the correct position, you may have defective cartridges. If you are using after market cartridges, the electronic sensor chip built into the cartridge may be defective. I would remove the cartridges and try using OEM cartridges. You can also try new aftermarket cartridges from a different vendor. This should clear the problem.
Let me know if this does not solve the problem and we can look into other potential solutions.