That is helpful, although it makes me curious in a few ways. Earlier in the thread, you said that your DTs were born in 2015, and your SMP stopped in Feb 2016, then you were completely unemployed in June 2016. The image you've posted isn't completely clear, I've tried zooming, etc., but it seems to suggest that your Twins are only being given Tax Credits from May 2016, although your total award was given from April 2016, and I can't work out why, if they were born in 2015. They should have been eligible as soon as your award started, I think? It's only 25 days, but it's 25 days each...I don't know why there should be a delay for their entitlement.
The second thing that makes me curious is that you say there has been no change in your circumstances, but the deductions from your award are £4781.50 for Working Tax Credits and £4563.51 for Child Tax Credits. When you add those together, they total £9345.01, and if you reverse the withdrawal taper calculation: £9345.01/0.41=£22,792.71, then add the income disregard: £22,792.71 + £6,420=£29,212.71, you can see that it relates to a much lower income of just over £29,000.
So the payments sound right, given the amount they intended to pay you, if they split the payments into 9, 4 weekly payments, because £2780.45/9= £318.93. However, I don't think they should have paid you that much, given that you were on £32k. I think they only deducted the
amount you should have had deducted if you were on £29k. Which is the same situation this year. There are two possibilities there. It could be that they genuinely thought you were on £29k and have suddenly realised you were on £32k in 2016/2017 and are on £32k this year. Or, they could have known you were on £32k but somehow have applied the wrong deduction and this has suddenly been realised. I think that is less likely, but anything is possible.