Hi,
I had exactly the same issue, using Bulk Edit to remove sale prices and found that it still displayed the regular pricing crossed out and the old sale prices as if it was still running. I have over 400 products so was not viable to update each one individually to sort out the problem.
I went into products and screen options, selected viewing 900 items to get all my products onto the same page.
Selected all of the products and then used edit from the Bulk Action tab above.
Clicked apply and after a few minutes all items were updated.
Afterwards all items were displaying correctly.
Hope this helps.