ModX Revo: Search button affects register and contact form and vice versa

I have the following problem: I have a register form showing up in the sidebar all the time if someone isn't logged in. I also have a contact form with FormIt and a search with SimpleSearch. If I try to search something everything's fine except of the fact that the register form gives me the result that no fields are filled out even if I didn't click on the register button. I just wanted to search. The same thing happens on the contact form with FormIt and vice versa.

What can I do about it?

You need to make sure that each of the forms have different "name" attributes for their submit buttons. Most form snippets have a property to either set the name of the input, or a prefix to identify the form.