Ink not recognized musical chairs mg7520

[Wld8hrt]

Put in a new canon pgbk black. After that every time I closed the printer a different cartridge would say it wasn’t recognized. Which one changed every time I closed the printer. I tried pulling out the print heads, resorting every thing. Same problem. 
took the new cart out and put the old back in. It still has some Ax’s over some of the cartridges. I was able to print (not perfectly) but I can’t put a new cartridge in without this problem. 

[Patrick]

Hi Wld8hrt,

Please open the cover to your PIXMA MG7520.,

From left to right, please make sure that the following ink tanks are installed:

CLI-251BK
CLI-251GY
CLI-251Y
PGI-250PGBK
CLI-251C
CLI-251M

How many ink tanks have been replaced since receiving this error?  Which inks have been replaced?

What is the error code that appears at the top of your printer's display?