Regular text messages load as picture messages

Hello everyone. This is my first time on here. I am just wondering if someone could tell me why I'm having the problem I'm having.

Lately just regular text messages that are sent to me show up as picture messages. This is a problem because I don't have unlimited picture messaging and it's $.25 per picture. I have a Pantech Jest by the way with a prepaid plan. If anyone knows why this is happening, please let me know.

Thank you!

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