What a citation marks
A cited passage is one written against retrieved evidence rather than from the model's memory. The passage is marked to show that, and a small citation marker sits with it. Where Kindred could match the citation to a specific source it retrieved for your analysis, the marker carries a number that corresponds to an entry in the Sources & References record.
What clicking a citation does
Clicking a citation takes you to the Sources & References record at the foot of the analysis, where you can find the source, read its tier and bias indicators, and follow it to the original document. The marker is the thread from a claim back to the evidence it rests on.
What a citation does and does not tell you
A citation tells you that the claim was written with a real, retrieved source in view, and, when it carries a number, which source that is. It does not tell you that the source has been mechanically checked to say exactly what the claim says. That is the honest limit that applies everywhere on Kindred: citations link claims to real retrieved sources, but the content of each claim is not yet mechanically verified against the source. The link is genuine; the final read is yours.
Why not every sentence is cited
You will notice that the reasoning is not decorated with a citation on every line, and that is deliberate. Citations mark claims that rest on retrieved evidence. The analytical work itself, the weighing of one argument against another, is reasoning rather than a factual claim, so it is not dressed up with sources it does not need. An uncited sentence is usually argument, not an unsupported fact.