I just need 1 blockchain confirmation and chipmixer page direct me to step 2, or maybe many transactions on this site that affect our step.
Don't worry, it has happened to me before too. You just wait a little more than expected. Maybe ChipMixer can answer on why that happens.
That makes me a bit worry after, because I must check to receive the address again to make sure I put the correct one.
I mean, haven't you already done that? You should always check where the money goes.
If you have noscript enabled then I could see that as being a reason it wouldn't progress to step 2 automatically and would wait for you to press it or potentially refresh.
NoScript is enabled by default in Tor, and since you can only access ChipMixer via Tor, waiting without refreshing won't work.