I have a question regarding wudu:

1) If I happen to accidentally go slightly from bottom to top, will that render my wudu invalid or only if it were to be intentional?

2) If I were to start slightly lower accidentally, does that render my wudu invalid?

3) If a limb accidentally touched another limb required for wudu (let’s say the right hand accidentally touched the left arm when wiping the right arm), does that render the wudu invalid?

1- No. It will not as long it is not intentionally done.
2- Yes.
3- No.