Transaction sort behavior

When I try to sort my transactions by payment/deposit, "blank" values still stand between sorted values.

I expected at least not to have those blank lines in between valued lines. At most, I would have seen blank rows at the bottom whichever is the sort (ASC or DESC).

Example:

https://github.com/ucoin-io/cutecoin/commit/5652bad7b2100613af09e3914a761e1abec77d95