chatty deleting texts

So far this is only happening with one person I text but it is the person I text the most. I had sent them a photo, and what’s been happening is after sending some texts in a back and forth conversation, if I leave chat and come back my side of the conversation is deleted and that picture I sent a while back shows up as the last sent thing. I sent another photo the other day to test and now both photos show up in place of my texts. If I send long texts those don’t get deleted but it will show older texts from the other person after my texts and then those photos. If its brief texts I sent they will be deleted.

I deleted the conversation with this person and started it again and its still doing it. Any ideas? I have not sent photos to anyone else so it might be some photo glitch as its only happening to the person I sent photos too.