The trouble with buying & fitting instruments like this is they draw your attention to stuff that isnt relevant in real life.
Waiting now for all the experts to chime in and rag the statement Ive just made :D
If the machine is working well and making nice coffee, that is all that is relevant. The rest is for endless academic discussion that in the end makes some owners very insecure about whether their eqiupment is working as it should or not.
That kind of insecurity is bad....really bad, and these forums see a great deal of it when people should otherwise & simply be enjoying their kit and their coffee
Apologies if this sounds a little blunt, but very often the truth is.....and there certainly is no malice intended.
My advice is first...dont buy this kind of stuff OR once it has been bought, to put it away in a draw where it cant do any harm.
For the rest of it. Is that behaviour normal? Most probably, if the machine is working as designed and built.
I genuinely hope that helps.
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