This could sometimes happen when you have two Khan academy accounts open at the same time and when you doing an exercise it can affect your connection. And because of this, it can ultimately have you restart and refresh your exercise. So I suggest that you try refreshing your Khan academy page and try to take the exercise again.

Hope this helps. :)

I only have 1 account and it said that too

Hi AHumanInLife and Cali Disney,

Could you please submit help tickets (submit a support ticket) for that particular technical problem?

Thanks!

I only had one tab open and it said that

ya same here