[GNC] Cannot change Trading splits

[Fred Tydeman]

I have an older existing transaction with splits for an ATM transaction
of getting Euros for US dollars.
I duplicate it with today's date.
I Click on Split to open up the new transaction.
I change the amounts  and tab out of each split.
And in the process update the currency conversion rate.
I Click on Enter on the menu line.
The two trading splits get changed to different accounts and amounts.
I change the two trading splits back to the correct accounts and amounts,
using Tab to exit each split.
Again, I click on Enter and the two Trading splits get changed.
Am I doing something wrong?

In case it makes a difference, I have multiple parent Trading accounts
with CURRENCY:USD and CURRENCY:EUR children.

OS: linux fedora 27
Gnucash 4.14