Fixed in CORE-2308
In the mean time if you would like to make the change effective before our next release you can modify /public_html/app/views/client/client_accounts_ach_info.pdt where it has:
<div class="form-group">
<?php
$this->Form->label($this->_("ClientAccounts.ach_info.field_accountnum", true), "account");
$this->Form->fieldText("account", isset($vars->last4) ? str_pad($vars->last4, 9, "*", STR_PAD_LEFT) : $this->Html->ifSet($vars->account), array("id"=>"account", 'class'=>"form-control", 'placeholder'=>$this->_("ClientAccounts.ach_info.field_accountnum", true)));
?>
</div>
And remove
"id"=>"account",