Copy records on a domain's DNS page is now Import current records, so it is not read as copying something to paste elsewhere. Stop importing, Remove imported records and Import again follow the same word, and the records list marks imported records as Imported.
A record you added now wins over an imported one with the same name and type. If you already pointed the domain's A record at a new host, importing leaves out the old provider's A record, so visitors are not sent to either server at random. TXT records are the exception, since one name often has several for different services; only a second SPF record is left out. The page says how many imported records were left out.