Sometimes when I send multiple texts in a short window, they are sent out of order. To me, it appears that they are sent correctly, but the recipient gets them in a strange order.
This has been happening for at least 2 months.
Phone model: Samsung Galaxy S9
Messaging app: built-in Messages
If it matters, the recipient uses an iPhone.
That definitely sounds odd. I suggest trying the steps below to see if it resolves the issue.
Also, I suggest clearing your cache.
Let us know how it goes.