I had 2 accounts one on Robinhood and one on Etrade. The Robinhood was with a loss of 20k with 15k wash sales disallowed proceed with 115k and Cost with 135k. The Etrade had a loss of 10k with 600 wash sales disallowed proceed with 250k and cost of 260k. It was kind of weird and I looked into Robinhood cross-checking the 1099B and transactions statement and found out Robinhood flagged the correct wash sales, but they messed up the deferred loss to the cost basis of the next batch. I surveyed through around 50 trades and they all had the same issues. I adjusted the wash sales to the correct amount for 2021 and reversed 2020 wash sales that I did not look into and Robinhood did not recognize 2020 wash sales disallowed to 2021 securities disposition. I hope this helps.
