Transformations css ne fonctionnent pas correctement avec IE

Bonjour,
J'ai intégré des animations css sur une page web :
http://lusinagaz.free.fr/colabquarter/bdi.html
Elles fonctionnent correctement sous Chrome et Firefox mais pas sous IE ou Edge, les textes se superposent à la fin.
Si quelqu'un a une idée de solution à ce problème, c'est cool.
Je mets un extrait du code qui ne fonctionne pas :

.main-container .title-1 {
  -webkit-animation: focus-in-contract 1.3s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards 1.8s, text-blur-out 1.2s ease-in forwards 5.5s;
  -moz-animation: focus-in-contract 1.3s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards 1.8s, text-blur-out 1.2s ease-in forwards 5.5s;
  animation: focus-in-contract 1.3s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards 1.8s, text-blur-out 1.2s ease-in forwards 5.5s;
}
.main-container .title-2 {
  -webkit-animation: focus-in-contract 1.3s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards 6.8s, text-blur-out 1.2s ease-in forwards 10.5s;
  -moz-animation: focus-in-contract 1.3s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards 6.8s, text-blur-out 1.2s ease-in forwards 10.5s;
  animation: focus-in-contract 1.3s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards 6.8s, text-blur-out 1.2s ease-in forwards 10.5s;
}
.main-container .title-3 {
  -webkit-animation: focus-in-contract 1.3s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards 11.8s, text-blur-out 1.2s ease-in forwards 15.5s;
  -moz-animation: focus-in-contract 1.3s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards 11.8s, text-blur-out 1.2s ease-in forwards 15.5s;
  animation: focus-in-contract 1.3s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards 11.8s, text-blur-out 1.2s ease-in forwards 15.5s;
}
.main-container .title-4 {
  -webkit-animation: focus-in-contract 1.3s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards 16.8s, text-blur-out 1.2s ease-in forwards 20.5s;
  -moz-animation: focus-in-contract 1.3s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards 16.8s, text-blur-out 1.2s ease-in forwards 20.5s;
  animation: focus-in-contract 1.3s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards 16.8s, text-blur-out 1.2s ease-in forwards 20.5s;
}
/**
 * ----------------------------------------
 * animation focus-in-contract
 * ----------------------------------------
 */
@keyframes focus-in-contract {
  0% {
    letter-spacing: 1em;
    filter: blur(12px);
    opacity: 0;
  }
  100% {
    filter: blur(0px);
    opacity: 1;
  }
}
@-webkit-keyframes focus-in-contract {
  0% {
    letter-spacing: 1em;
    filter: blur(12px);
    opacity: 0;
  }
  100% {
    filter: blur(0px);
    opacity: 1;
  }
}

Merci.