Delaying mail but still,there

I have iPhone 5s and iPad Air 1.
Noticed recently that tho I am deleting and emptying trash on iPhone emails
They are still appearing on my iPad.
Time period is mar 24-26...
Otherwise all other emails are being deleted and removed as usual.

I checked mail in settings for both iPhone and iPad
Also,checked cellar data is the same....
Can't figure out what I'd did during those dates to cause this problem!

My iPad has been updated to most recent version. And is has been rebooted also.

Is it from a single email provider or from a few different email providers? I don't see how that is something that could just start happening, unless... maybe hacked, or provider issue. Are you using the default iOS Mail app, or stand alone app?

Thanks for replying. I have only 1 provider..... by provider I assume you mean my internet provider.
I have 3 gmail accounts but the other two work just fine.
Not sure how to answer your query bout ISO app or standalone. I set up my 3
gmail accounts in settings in my devices.

As the emails for that address on my iPhone is working okay,,, what if I remove that email address from my iPad- then reboot iPad and add email again.
How can I tell if I was hacked?
Should I go to gmail site and reset password?
As opposed doing it on iPad.