I noticed the new LDA node has got a strange behavior for a LDA. For example, usually performing a LDA in Knime I use the R or Python nodes. The results you expect :
LDA works on the learner / predictor mode. You learn a class from numerical variables and you return the predicted class from the LDA with the attribution probabilities for each returned groups as usual. So you should be able for example to use the scorer node with it.
I join a short example of the expected results in attachment.