I know that if I just hit the public queue, it will sometimes do this. Are the records one that YOU have transcribed, or some random sample of stones from whereever and whenever?
I have not had this problem for a few weeks; have you tried clearing your cache?
Try various combinations of selecting only English as language, and a particular cemetery that you know you have not transcribed from recently.
I just ran through about 30-40 from the main queue and only got one hit that was already transcribe, so can't figure out why you are having this problem.
Did you try sending a request to BG support? They might know how ti fix it for you.
Give them your device and OS; and a few URLs for some the records that you are seeing that are already transcribed.
Sorry I can't help.