.modal:nth-of-type(odd) {
  z-index: 1049 !important; 
}
.modal-backdrop.show:nth-of-type(odd) {
  z-index: 1048 !important; 
}

.modal:nth-of-type(even) {
  z-index: 1052 !important; 
}
.modal-backdrop.show:nth-of-type(even) {
  z-index: 1051 !important; 
}