Problems receiving SMS text messages

Problems receiving SMS text messages

I have alerts set up to send SMS texts to multiple numbers. One of the numbers is my own. Recently, the alert sent the text as it should but only to me. The other people did not receive it. Has this happened to anyone else? I tried changing the format with and without the country code but still same result - text to me only. I verified with one of the other users that they did not have any message filtering set up. Not sure how what else I can do.