Issues with Macros switching from 2010 to 2019

Hi I was wondering if somebody could give me some assistance. I have been running macros in word 2010 for years, one click sends the document out to Outlook and then comes back to word and closes word down. Since updating to 2019 it send the email but then opens another email message box with nothing in it except for the attachment that was sent originally. This has only happened since the upgrade. So it is npo longer fluid, i have to close this box down manually to continue back to word. Would anyone have an idea as to what is going wrong? Your help would greatly be appreciated David