Action is done here : https://github.com/LimeSurvey/LimeSurvey/blob/ca844d498966355614ac446b48306b0df34d2f8c/application/helpers/export_helper.php#L215

Can you test replacing with fir the 2 part ?
$strTemp = str_replace(array("'"), array("''"), trim($strTmp));

Tottaly unsure of SPSS compatibility with such fixes, and maybe related to SPSS version …

@DenisChenu, did I get you right that I should adjust the code this way by adjusting the second IF(...) with the adjusted str_replace(...) details?
$strTmp = mb_substr(stripTagsFull($row[$fieldno]), 0, $iLength);
if (trim($strTmp) != '') {
if ($q == '\'') {
//$strTemp = str_replace(array("'", "\n", "\r"), array("''", ' ', ' '), trim($strTmp));
$strTemp = str_replace(array("'"), array("''"), trim($strTmp));
}
if ($q == '"') {
$strTemp = str_replace(array('"', "\n", "\r"), array('""', ' ', ' '), trim($strTmp));
}

We can't export line feed ias line feed in SPSS because SPSS don't understand line feed. But seems export remove line feed and don't replace it by a space.

Replacing line feed by white space.

New version released.