Blue lines on SharePoint folders and items in document library

I think it's got something to do with what the Sharepoint sees as a REPEAT of a file. 

For example, if you have a file that has a similar name in folder A and in folder B;

Lets say, you already transferred folder A to sharepoint

and now you transfer folder B (from your main windows drive) to Sharepoint -

then because Sharepoint sees that you have 2 files (with similar/same names) from two different folders (folder A & folder B);

- (more than one file from each folder A and folder B has file(s) with a similar name/title)

- your folder will then have the three blue lines on it.