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Mutual funds 101 ...

You will buy and sell mutual fund stock like any other stock ... sales are reported on a 1099-B.  You report the sales of the fund you bought in the year of sale. 

Mutual funds distribute  Dividends and Cap gain distributions on a 1099-DIV  from the INTERNAL happenings in the fund ... the dividends THEY earned and the sales THEY make inside the fund itself.  A mutual fund is invested in many different things and the 1099s at the end of the year report your portion of the activities inside the fund while you owed it.  

Dividends distributed by a mutual fund are reported on the 1099-DIV box 1a and if some of those dividends are qualified that amount is listed in box 1b for special tax treatment.

Mutual funds buy and sell WITHIN the mutual fund itself and if they have any CAPITAL GAINS at the end of the year that is distributed and reported on the 1099-DIV box 2a. 

Mutual funds  NEVER distribute capital LOSSES ... those are always retained by the fund and are used to negate capital GAINS within the fund itself ... then only net cap gains are distributed.   If at the end of the year there  are  only net cap losses then those are RETAINED by the fund to be used in future years.  

On the 1099-DIV there could be a host of other items reported in the other boxes ... see the instructions for those boxes on the back of the form or read up on the IRS site : https://www.irs.gov/forms-pubs/about-form-1099-div

If you do not understand how mutual funds work please contact your broker or fund manager for an explanation of these concepts/rules.