Why is ‘Reply STOP to opt-out on a different line than in the preview?

When sending a test broadcast, the ‘Reply STOP to opt out’ is formatted slightly differently than it will be in the actual broadcast.
Here is an example of a live broadcast:

7310857E-6AA5-4855-8A1C-2BF859F65949_4_5005_c.jpeg

Here is an example of a test broadcast:

2FC499B0-EDCE-4631-A9F0-0BF2F874431B_4_5005_c.jpeg