It might be similar to the issue I have. When I submit Gas meter reads in the App, if I do both together often they get switched or one meter also winds up with the other meters number (probably 8 out of 10 times)
So it might be like Meter 1 17250 Meter 2 00002 and after submit and I go back to check Meter 2 might now be saying 17250(when previously it was 00002), or it could be a vice-versa situation. Ages ago I made mention of this type issue, but here and e-mail.
What I do now is, I'll submit separately . So Meter 1 17250, skip meter 2 then submit. Then go back Skip meter 1 submit Meter 2. I've been doing it that way for a while now.If fact just a few weeks ago I actually had put both meter reads in (laps of judgement) and it happened again, so guess never fixed that issue.