Good morning, @larry_howard ...
I had to do a bit of searching here in the Community to find the actual documentation on the "Start Assignment" wording on that button. There was a Feature Idea that was submitted back in November 2016 called Changing the "Submit Assignment" Button - Instructure Community (as you can see, lots of conversation about the topic), and just this past March, the wording was changed from "Submit Assignment" to "Start Assignment". You can find more information about why this was changed by visiting Canvas Deploy Notes (2021-03-31) - Instructure Community. So, while I'm not sure that I would say this is "wrong", it is intended behavior as of March 31, 2021.
I know this might not be the exact answer you were hoping for, but I hope it has helped in some way to answer your question. Sing out if you have any other questions about this...thanks! Be well.