Tab issue when entering details in the Purchase Date fields

Previously, when entering fields in the “purchase date” section, I could press the tab key on my computer keyboard as a shortcut to move forward from field to field. But recently, I noticed that no longer works. Instead, when I press the tab key, it moves me BACKWARD to the previous field instead of forward to the next one. Here is a link to what’s happening, so you can see for yourself. Hope this is an easy coding fix. Thanks!