PHP form submit not working on specific machine -

PHP form submit not working on specific machine -

i working our backend system, there form submitted through html submit button via post method. on server side form validated through zend form , info stored in mysql , page redirected info listing page. flow working fine systems except particular machine (windows machine browser) form won't submitted properly, data got corrupted, few fields missing. other functionalities (including form submit) working fine on same machine, except form.

code phtml (form)

<form name='frm_main' id='frm_main' enctype="multipart/form-data" action="<?php echo $_server['request_uri'];?>" method="post" > <?php $this->form->layerhtml->setattrib('cols','85'); echo $this->form->layerhtml ;?> <input type="submit" value="submit" class="green_btn"> </form>

controller (server side)

if($this->getrequest()->ispost()){ // processing }

php forms