Why suddenly did my K9 receive mail out of time order?

[barelykeepingup]

I am not tech savvy & need help as to why suddenly k9 received mail is out of time order

I get a notification at the top. I pull it down, read it, save as unread, and its gone! I'm only getting some email also, not all AND the few I'm receiving are all out of time received order. I received on my phone today maybe 10 emails but on my PC, maybe 75. Refreshing does nothing. I turned the phone off, turned it on...nothing. Help!