Techtool Protection showing only One External Drive - 7 attached

Hello.

I am on an iMac (27-inch, Late 2013)
I am running OS 10.12.6 and TechTool Pro 9.5.3

I have Installed and re-installed TechTool Protection 4 times. Every time I do, only 1 of the 7 External Hard drives I have shows up in the TechTool Protection Pane.

I have no problems with my Mac. I have run the TechTool tests on my attached drives and all have passed. Yes, Techtool sees all the attached drives.

I own 4 WD My Book drives, 1 Seagate BackUp+, 1 Seagate Expansion Desktop and 1 external SSD.
TechTool Protection sees 1 of my WD My Book Drives.

Does anyone have any suggestions?

I would like to use the TechTool protection feature but, I need it to work on all my drives.

Thank you!