Image problem in Zoom Events

Hi, guys. 

I've been setting up a webinar through Zoom Events with a volume of about 100 attendees.

I've recently found out that when people are registering with email addresses, they receive an email of verification code in the first place which shows an old image of masthead, not the one currently uploaded.

It looks like the same problem happens when I send out a speaker invitation

masthead image had been changed several times due to design and panel changes.

I'm trying as many delete and saves as I can but it just simply doesnt' work.

and It looks like Zoom doesn't provide real support for normal users.

Can anybody help me?