Hi Ivan,
A user should be able to answer any question by typing the answer. If it is a choice answer then what the user types must match the text on one of the buttons identically. If the user fails to type a recognised choice then they will be given an error saying we didn’t understand their answer and then repeat the question. The buttons are given again when the question is repeated.
Unfortunately I’ve not been able to reproduce your issue with the buttons being missing after a user has given a wrong answer. Could you please answer the following and also share a screen shot showing the buttons not being offered the 2nd time?
Which platform are you using when you find this issue?
How are your choices set up in the Ask a Question?
How many wrong answers do you allow the user to make?
Thanks.