F1040X-041 rejection / RefundAmt on 1040X does not match total on form 8888 - yet it does!

Anyone seen this one?

My federal amended efile was rejected with:

"F1040X-041 - If Form 8888 is present in the return, then Form 1040-X, 'RefundAmt' must be equal to Form 8888, 'TotalAllocationOfRefundAmt'."

 

Checking the forms, the 8888, box 8 is equal to 1040X, box 35a, so not sure what the problem is or how to fix, short of not using form 8888.