From about a month there is an issue with LinkedIn Followers Counter. There is a change in LinkedIn API and that blocks the counters of our app.
We are still waiting to see when that change will be officially released so that we can also make the change needed at our plugin. For now we just don’t know what have to be changed as there is no information announced by LinkedIn.
The only thing you can do to make your LinkedIn Followers counter display any value is to use manual value option. 

Manual Display of Followers Counter Value

 
1. Go to Like, Follow & Subscribe -> Social Followers Counter: Settings and activate Allow user values
Screenshot_6
2. Then go to Like, Follow & Subscribe -> Social Followers Counter: Social Networks -> LinkedIn and under Manual user value fill the number manually 
Screenshot_1
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