Your published code does not match the debugger code, your code has this, which (almost!) Is correct:
$(this).siblings('.RegText').toggle(true);
The debugger has this, which is wrong:
$(this).siblings(('.RegText').toggle(true));
You need to update everything that you actually debug on this code, without additional brackets, otherwise you will get quite funny behavior there.
#, , , . $("row10") ( <row10>), $("#row10") ( id="row10"), :
$('#' + this).siblings('.RegText').toggle(true);