How to remove these Imagick lines?

Question

PHP

In general, when saving pdf to jpg, the following picture is obtained:
pixs.ru/showimage/Screenshot_9142411_27374966.png
when viewed in libreoffice, this is obtained:
pixs.ru/showimage/Screenshot_3823697_27374970.png
The code for converting is nothing unusual:

$im->readImage($fpath);
            $im->resetIterator();

            # Combine multiple images into one, stacked vertically.
            $ima = $im->appendImages(TRUE);

            $ima->setImageFormat('jpeg');
            return $ima->writeImages($filename, TRUE);

Who knows what could be the matter, help, pliz! P.s. when viewing the resulting PDF, there is no such thing!
Previously, there was a 2012 version of ghostscript, everything was OK, but it generated slowly and crashed!
I installed the last of the repositories -2016 and then this bang-trouble (! but it generates quickly, but crookedly! ........