Retirement tax questions

These are reported by Vanguard twice in 2021: first on 03/19/2021 & 12/28/2021 for long-term; and only one time for short-term items: on 12/28/2021. The short & long term were on a combined 1099-DIV form. So according to the instructions on the form I go back and check when my purchases were, except increases in the fund price are what trigger increases do they not.