Modal window shifts after reopening.

At the first time the window opens correctly. If I close it and open it again, it appears at the bottom of the screen. How to fix it?[attachment=110120_20171214155323_snap1-cr-jpg.jpg][/attachment]
[attachment=110120_20171214155403_snap2-cr-jpg.jpg][/attachment]

At first opening style of a modal window is:

<div class="ui small  modal form-archvizdoma transition visible active" style="margin-top: -353px; display: block !important;">FORMCONTENT</div>

After reopening margin-top changes to 0px:

<div class="ui small  modal form-archvizdoma transition visible active" style="margin-top: 0px; display: block !important;">FORMCONTENT</div>

How to fix it?

This helped me to fix the problem.

in \libraries\cegcore2\admin\extensions\chronofc\views\form\form_output.php
I've replaced line 59:

$modal_def = '$(".ui.modal.form-'.$form_id.'").modal('.json_encode($settings).').modal("show");';

with these lines:

$foo ="'setting',";
$modal_def = '$(".ui.modal.form-'.$form_id.'").modal('.$foo.json_encode($settings).').modal("show");';

still not fixed in last update.