Hello Ruben Herrera,
If you Wikis are either stored in ~/App_Data/Wiki.xml or in database, depending on your configuration. Search indexes are also stored in App_Data folder. If your servers have their own copy of the website, then when you make changes to those the different servers' copies of the App_Data folder do not updated. If you are running a web farm or an NLB environment the best suggestions (if it is the same website) is to set your web servers to use the same physical website.
This can be accomplished by creating a network share of the physical directory of the website and then configuring the different web servers to point to this notwork share.
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