Form works on desktop browser but not mobile browser

I've checked the web but nothing really compares to this exact issue, hence this question is being asked.

I have a register form. It works on my laptop and desktop PC however faces issues when testing on a mobile device. I have tried it with many mobile devices and they all seem to redirect to 'mywebsite.com/#'. The main issue here is that I should receive an error stating that their are blank fields (Just as it does on the browser) however it seems as if mobile devices just simply get redirected with a hashtag and ignore the error warning.

I think it's something to do with JQuery possibly but I do not know for certain.

<form id="registerrform" action="#" method="post" class="registerbox">
                <div id="registerrerrors"></div>
                <div class="form-group">
                    <input type="text" name="username" class="form-control" placeholder="<?php echo $sn['lang']['username'];?>"/>
                </div>
                <div class="form-group">
                  <input type="email" name="email" class="form-control" placeholder="<?php echo $sn['lang']['email_address'];?>"/>
                </div>
                <div class="form-group">
                    <input type="password" name="pass" class="form-control" placeholder="<?php echo $sn['lang']['password'];?>"/>
                </div>
                <div class="form-group">
                    <input type="password" name="confirmpass" class="form-control" placeholder="<?php echo $sn['lang']['confirm_password'];?>"/>
                </div>
                <div class="form-group">
                  <select name="gender" id="gender" class="form-control">
                    <option value="male"><?php echo $sn['lang']['male'];?></option>
                    <option value="female"><?php echo $sn['lang']['female'];?></option>
                  </select>
                </div>
                <center>
                  <button type="submit" name="registerrgo" id="registerrgo" class="btn btn-success sign-up">Sign up</button>
                </center>
        </form>