Why is my email showing the incorrect attachment?

[AC Question]

I use my phone for work and get a lot of email attachment. Starting on 2/25, every email attachment opens the same attachment dated 2/25. The attachment is correct when I look at it on my PC, just not on my phone.

 

[ManiacJoe]

Which phone?
Which version of android?
Which carrier?
Which email app?
Which email provider?