Glitches are ridiculous

Please fix all the glitches going on in this app, not sure what is going on since the last update. It will show that someone still hasnt opened the message a few days later which I found odd, once I singed out at logged back in it said that the message was opened a few days ago & I have a reply from that day. So it looks like Im getting ignored/ignoring people for a number of days.

D_S4 about Snapchat, v10.14.1.0