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The users who have access to edit the site and upload data are belong to visitors group<br />
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What do you mean configuration issues?
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The users who have access to edit the site and upload data are belong to visitors group

What do you mean configuration issues?

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Do they also belong to the members group? Users have permissions of the highest level of permission they have.
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Do they also belong to the members group? Users have permissions of the highest level of permission they have.

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I created a site with SharePoint and i added a lot of users as visitors. These users didn't had any permissions for upload documents or edit the the site. <br />
<br />
Unfortunately suddenly the visitor now they have the ability to upload data and edit the site. <br />
<br />
I don't understand what is the problem and how to fix this issue. <br />
(A lot of persons are still have visitors permissions but can upload data and edit site). How to fix &nbsp;this ? &nbsp;<br />
(I use SharePoint online from office 365 )
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I created a site with SharePoint and i added a lot of users as visitors. These users didn't had any permissions for upload documents or edit the the site. 

Unfortunately suddenly the visitor now they have the ability to upload data and edit the site. 

I don't understand what is the problem and how to fix this issue. 
(A lot of persons are still have visitors permissions but can upload data and edit site). How to fix  this ?  
(I use SharePoint online from office 365 )

Problem with permissions on SharePoint

Microsoft Sharepoint is a software platform and family of software products used for collaboration and web publishing combined. These capabilities include developing web sites, portals, intranets, content management systems, search engines, wikis, blogs, and other tools for business intelligence and collaboration. SharePoint has a Microsoft Office-like interface, and it is closely integrated with the Office suite.