Emails on computer show date and time as the date and time I opened Thunderbird and not the actuals

When I open Thunderbird email on my computer, it loads in my emails. These come from my Hostgator email server. The date and time of the emails show as the current date and time, not the actual date and time that the emails were received on the Hostgator server. For example, if an email was actually received on Hostgator 3 days ago at 5 pm. When I open Thunderbird at 9 am today, the date and time received will show today at 9 am. And nothing that I can see on the email that I have on my computer shows the actual receipt date. I have tried some things on my own, and I have chatted with AI and made some changes to what's showing on the headers. But nothing has worked to resolve the issue.