Thank you for the clarification, Nagev. It appears that I am running into the same thing that @dizietemblesssma is encountering in their post. I would record something for this but what I am experiencing is captured in their post exactly. It looks like since my mods were originally erroneously flagged as update available, the state of their update status appears to be permanently stuck as update available. Checking for updates doesn't clear these erroneous update flags and neither does the Clear Update extension. Here is a screenshot of my Vortex searching for mod updates and how it still shows a bunch of mods needing an update when they don't and didn't before 1.13. Only one update in the visible list is correct (B42 Optics NV Patches) and out of the 43 with update available around 10 are real updates.
@Petty7 - You might want to double check your mods again because the Clear Update extension only temporarily clears the update flag and it will reset the clear when you restart Vortex.