During testing I got a renewal email. Then I went to the website and purchased the product again. (The product is for 365 days)

I purchased the product again on the website, Then I checked the database. The program did update the wp_um_switcher.expire_time field.

the expire_date is the date-time of the purchase plus 365 days, but if think that for a renewal it should be 365 days from the previous expiration date.