Plugin upgrade disabled links to other blogs on multisite?!

I have just updated W3 Total Cache on my multisite installation of WordPress and I am experiencing an odd problem.

I get multiple instances of the same site from the top bar, as seen in this picture.

https://d.pr/i/Lfgn

Any clue so as to what is wrong? Thank you in advance.

https://www.ads-software.com/extend/plugins/w3-total-cache/