The data set was oversampled prior to being loaded into Alteryx (which is not clear from the sample, the orignial data had 5% YES responses) and therfore the level was set to the original sample rate, not the data as available.
You are correct, for the Lift-Chart you need to input the True Response Rate (of the target value ex. for "yes" if you're trying to predict the "yes") before any Oversampling. You can check the true response rate using the Frequency Table tool from the Data Investigation palette before any oversampling you're doing. In the above workflow, the data was oversampled before being brought into Alteryx and therefore the workflow already has oversampled data at the input (which might be a bit confusing).
on the second question, we'll need to look at the workflow. If you can, upload it to this thread; or if you prefer, email it to firstname.lastname@example.org and one of our customer support engineers will be in touch.