collapse menu açılırken aniden kapanıyor

<nav class="navbar navbar-expand-lg navbar-custom navbar-light bg-light"> <div class="container"> <!-- LOGO --> <a class="navbar-brand logo" href="<?php echo URL; ?>"> <?php echo "<span class='text-dark'>".$this->logo."</span>"; ?> </a> <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarsExample07" aria-controls="navbarsExample07" aria-expanded="false" aria-label="Toggle navigation"> <span class="navbar-toggler-icon"></span> </button> <div class="collapse navbar-collapse" id="navbarsExample07"> <ul class="navbar-nav ml-auto"> <?php $sonuc = $this->db->listele("menuler"); foreach ($sonuc as $menuler) : ?> <li class="nav-item <?php if ($menuler["active"] == '1'): echo 'active'; endif ?>"><a class="<?php if ($menuler["Tip"] == '2'): echo 'btn btn-success navbar-btn'; else: echo 'nav-link'; endif ?>" href="<?php echo URL.$this->seo($menuler["Ad"]); ?>"> <?php echo $menuler["Ad"]; ?></a></li> <?php endforeach; ?> </ul> </div> </div> </nav>

.navbar-custom {  width: 100%;  border-radius: 0px;  z-index: 999;  padding: 10px 0px;  margin-bottom: 0px;  -webkit-transition: all 0.5s ease-in-out;  -moz-transition: all 0.5s ease-in-out;  -o-transition: all 0.5s ease-in-out;  transition: all 0.5s ease-in-out;}.navbar-custom .navbar-nav li a {  color: rgba(255, 255, 255, 0.75);  font-size: 15px;}.navbar-custom .nav>li>a:focus,.navbar-custom .nav>li>a:hover,.navbar-custom .navbar-nav li.active a {  background-color: transparent;  color: #ffffff;}.navbar-toggle .icon-bar {  background-color: #ffffff;}.navbar-btn {  padding: 5px 20px !important;  text-transform: none !important;  font-weight: 400;  margin-top: 8px !important;  margin-left: 10px !important;}.logo {  font-weight: 700;  font-size: 22px;  color: #ffffff !important;  letter-spacing: 1px;  text-transform: uppercase;}.logo i {  margin-right: 7px;}.navbar-toggle {  font-size: 30px;}.navbar-custom .btn-custom {  margin-top: 8px;  margin-left: 20px;}.nav .open>a, .nav .open>a:focus, .nav .open>a:hover {  background-color: transparent;  border-color: #337ab7;}.sticky-wrapper {   position: absolute;   width: 100%;}.sticky-wrapper.is-sticky .navbar-custom {   padding: 10px 0px !important;  background-color: #3c4046;}.sticky-wrapper.is-sticky .navbar-custom .logo span.text-custom {  color: #ffffff !important;}