Using external hard drive

I have Skyrim and all of my mods on a portable hard drive so that I can play on two different computers. When I use the external hard drive on one computer it allows me to right click on the mod in Vortex and go to the nexus page for that mod (this is because I used this computer to download the mods). When I use the other computer and plug the external drive in I get the following messages under the "Plugins" tab:

Failed to parse this plugin and not deployed when everything says "enabled"

Also, when I switch the external hard drive between computers I get a message at the top of the "Plugins" tab on Vortex inside a yellow banner "This list may be outdated, you should deploy mods before modifying it". I'll deploy the plugins, they will say "enabled" in green but just I mentioned above, I get the sign that looks like an eye with a slash through it and when I hover over it the message "not deployed" appears.

How do I fix this? I should be able to run Skyrim on more than one computer through my external hard drive shouldn't I?