The received text message will overwrite the previous one.

I don't think it's coverage, because sometimes there are errors between the gateway and the signal. In fact, the information you received before is the same as the information you received later. Just because the message you received earlier was delayed by the signal and gateway. Although it shows that you have received the message, there will be something missing. If the signal is good, you will receive the second message, and the text and content are complete. Let's see if this is the case, because my mobile phone will do the same.