cant delete multiple emails after search - no radio button

Hi

Im trying to clean my mailbox out - I have loads of newsletters that come in.

I have a gmail and hotmail account on the phone.

In the search, I type a search term like "agoda" and all the Agoda emails come up.

When I hit edit (in order to make each one have a radio button that I can touch to select that email and delete it), not all of them have the radio button.

If I do cancel out and try again, even less radio buttons come up.

Any idea what is going wrong?