I still cannot reproduce this problem.
Can you check which filter is wrong in file:
theme-translation-for-polylang.php
by commenting these lines:
add_filter(‘gettext’, ‘tt_pll_gettext_filter’, 1, 2);
add_filter(‘esc_html’, ‘tt_pll_esc_html_filter’, 1, 2);
add_filter(‘ngettext’, ‘tt_pll_ngettext_filter’, 1, 4);
add_filter(‘gettext_with_context’, ‘tt_pll_gettext_with_context_filter’, 999, 4);