DrForinor The water from the left spout has actually run down from outside the portafilter and dropped into the left spout. You have noticed it because it’s there before the coffee starts to flow. You can see the drops continuing to add themselves to the stream of coffee on the left.
I’d definitely remove the sticker…they can tarnish and on E61 machines I have seen the chrome actually pitted under a well blackened hot sticker
Apparently cafelat gaskets do work really well on Liz, although I have never used one…I intend to pick some up from Lelit when I am next in Brescia, hopefully in the spring.