I've noticed for a bit now that I have been unable to locate some email conversations in my inbox.
At first I thought I may have accidentally deleted the messages but today I when i went to look for an order reference number which is in the body of a fresh email that has just arrived and nothing shows, yet there are at least 2 other emails in here and none are displaying in the results. 
Doesn't matter if it's my mobile app or my web browser. 
Anyone noticed anything similar?
See screenshot.
At first I thought I may have accidentally deleted the messages but today I when i went to look for an order reference number which is in the body of a fresh email that has just arrived and nothing shows, yet there are at least 2 other emails in here and none are displaying in the results. 
Doesn't matter if it's my mobile app or my web browser. 
Anyone noticed anything similar?
See screenshot.