Quote from: GazetaBitcoin on Today at 08:06:37 AM

So I knew that the feedbacks given by DT (I mean DT1) users change the Trust score but I noticed that also DT2 users' feedbacks change the Trust score. I was not aware of this. Is this normal? I checked this by looking at a profile URL and adding ";dt" at the end of the URL, of course, in order to see that profile the way it shows when being watched from DT perspective.

That's normal, and as far as I know has always been this way. By default, the Trust settings use Trust depth 2.

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Furthermore, if DT2 users can influence Trust score, is there any other level of DT which can influence it (DT3 / DT4)?

Yes, change the Trust depth. Anything above 2 is likely to make that page very slow to load.
Note that the Trust depth doesn't only apply to DefaultTrust, it applies to your own custom Trust list too. So you trust the inclusions of the users who are on your own Trust list.
See Personal Full Trust Depth viewer for all users for the large recursive implications this has. If you want an update: post there.