Hi,
It is assumed that all h5p contents created from the backend must be available to insert in the frontend!
That is not the case in my case. As you can see in my backend there are 10 h5p contents created by Edner Zephir http://prntscr.com/hdsxsu but this same user (Edner Zephir) can not see those contents from the frontend http://prntscr.com/hdt2fm.
Please try adding this code in your wplms-customizer.php file in wplms customizer plugin :
add_filter('wplms_h5p_contents_limit',function(){
return 100;
});