One of the multiple submitted paper is published and others are withdrawn
Whatever you do in the future: do not submit the same manuscript to multiple (not even two) journals. 

If you have managed to get the manuscript accepted in one journal you need to immediately withdraw all others. You state you have given "personal reasons" whereas in reality you should have provided a serious excuse to the journals for wasting their time.

If you have withdrawn all other manuscripts there should not be any further impact on the one accepted for publication. You should learn from the experience and perhaps acquaint yourself better with the publication process so as to avoid mistakes such as these again. If repeated, it may affect you adversely by gaining a bad reputation or possibly being "banned" from certain journals by their editors. So most negative impacts, if any, will fall on you.