Problem in preview of mail after upgrading to HiSierra

After upgrading to HiSierra, have problem while showing contents of mails with the same caption in preview.

Preview shows the contents of the first clicked mail and even if I click to another mail with the same caption, nothing change on preview window.

To let it changed, I have to choose another mail with complete different caption and to come back.

example:

Caption "dog"

1st mail contents "I have a dog"

2nd mail contents "I don't have dog"

Clicking 1st mail and then 2nd mail: contents of 2nd mail "I have a dog"

scrolling to another mail and click to mail with caption "cat", then come back to 2nd mail: contents change to "I don't have dog".

When you have 10-20 or more mails with the same caption, it is a nightmare.

Hope someone has solution for it.

Thanks.