Sandy,
My r2bbs.com domain had an expiration date of 2019-09-17 and my rempfer.net would have expired 2018-12-22.
I transferred both to ZoneEdit and subsequently added the maximum nine additional years to each. Thus plus ten years for each.
Now, in ".../manage/domains/info" each shows "Date Next Due" of 22 May 2027.
So if I understand you, this number is a placeholder and will be updated to reflect original expiry date plus ten years (in my case) once the transfer is completed. If this is so, then perhaps a little blurb explaining "this date may change once registrar transfer is complete" might be in order.
Of course it's possible -- even likely -- that no one else would notice this. But I do hope the dates will actually be 2029-09-17 and 2028-12-22, respectively.
Thanks!
Dick