Scroll jumps back and PHP string conversion error

Having issues with the scrolling lately.

First issue: From any sub page via menu link to the selector. After the destination page loads, the site scrolls very fast for a few milliseconds to the selector and jumps back to the top of the page and then smoothly scrolls down like it should be. (I have the force option for 3rd party scripts enabled. )

Second issue: PHP error: Array to string conversion

wp-includes/pluggable.php:2279
wp_verify_nonce()
wp-content/plugins/page-scroll-to-id/malihu-pagescroll2id.php:436
malihuPageScroll2id->validate_plugin_settings()
wp-content/plugins/page-scroll-to-id/malihu-pagescroll2id.php:240
malihuPageScroll2id->add_plugin_settings()
wp-includes/class-wp-hook.php:308
do_action('admin_init')
wp-admin/admin.php:175

Third issue: Not really this plugins issue as I understand it. I build a full screen mobile menu with the popup function of Elementor. Being on that page where the selector is, the scroll happens but the popup menu does not disappear after the touch click. This is not an issue of course if the user is on sub pages.

Any help would be much appreciated.