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I know that Robinhood has been experiencing many issues thus far this year with this. Did you try (I apologize if you already have, just curious) going directly to the 8949 to see what is listed on there? Go to the "Form" view (icon to top right) and do a search for 8949. I am guessing, however, that you probably imported it directly from Robinhood, though, given the number of transactions "properties"). I know they are working on a fix, but do not expect a resolve until mid-March. I trust you that your connection is strong. Please reach out to Robinhood because again I see a plethora of these issues daily with that brokerage firm's statements.