I has a warnings:

Warning: DefaultModLatestView::_sortEventsByTime(): Argument #1 ($a) must be passed by reference, value given in /modules/mod_jevents_latest/tmpl/default/latest.php on line 806 

Warning: DefaultModLatestView::_sortEventsByTime(): Argument #2 ($b) must be passed by reference, value given in /modules/mod_jevents_latest/tmpl/default/latest.php on line 806

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Solution was in file /modules/mod_jevents_latest/tmpl/default/latest.php on line 292 change

public static function _sortEventsByTime(&$a, &$b)

to

public static function _sortEventsByTime($a, $b)

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Joomla 3.10
JEvents 3.6.15
PHP 8