Trash Folder is Empty but shows Emails

I have a Samsung Galaxy S4 running the Lollipop OS. My ISP is Verizon and my email is run on MS Outlook. Since the Lollipop upgrade, the Trash Folder indicates that I have (for example) 35 emails, but when I open the folder is is correctly empty. The only fix I've read is to delete my email account and then reinstall it. I tried this but it only worked for about a day, and then my empty Trash Folder once again started indicating that the folder is filling up. Any ideas? Thank you.