My messages aren’t going thru but my partner is receiving them more then once? (3times) Why is that?

I can see "Testing" at 5:58 PM in your partner's phone. You post shows you have begun messaging at 6:23 PM.

There is something amiss in your communication.

However this is not an iMessage. For all SMS (Text) Message issues contact your Carrier (Cellular Service Provider) The agency who issued the SIM to you