Behaviour buttons different in android app then in ios app

Hi Forum, I have found an interesting something. I have created buttons which refer to a happypath in the bot conversation. Now we found out that the conversation on our Android devices is going flawless and the bot responds as expected so perfect. Now we have tested it on our Ios devices and now suddenly the bot doesnt follow the buttons anymore, even worse , it seems not to recognize at all the buttons, and tries to get confirmation of what we would like to state with the button.

Does anyone of you know where we can solve that issue?