FamilySearch has online the earliest instance of the temple ordinance. These are the only ones displayed on the Ordinance tab in RootsMagic's FamilySearch Person Tools. They are considered the official temple dates.
I remember when we worked on the Ordinance tab flow in the FamilySearch Person Tools. It became very clicky and labor intensive if we gave each ordinance a popup where the user had to tell what to do with it, like you do with adding a birth or other facts on the Share Data tab. To move multiple ordinance facts at one time made for a better user experience. There isn't anyway we can say oh you have one of those fact already lets just delete and replace automatically. Not every user wants that to happen. We don't want to force users to delete things they don't want to. It needs to be an option. So what you are asking sounds nice, but this is the reason why what you are suggesting is not part of the design. We will continue to revisit it. We know what you want, we wanted it to, but we have to make sure all users are accommodated. Right now the best option is to move only the dates you need over. If you select all then you will need to click the Edit Person button on that screen and delete the ones you don't want. We did mark the new ones added automatically primary.
FamilySearch will no longer allow patrons to upload their ordinances to the Family Tree. They are only considered official ordinances if it is in the Temple API. So if you have ordinances that they do not have, then you need to contact firstname.lastname@example.org for them to investigate what happened. One of the things they want is a scanned copy of the temple card with the dates stamped on it. I believe they can also go by the ordinance date and temple code but that takes longer. Otherwise the record of that ordinance is no longer available and it will need to be redone.