The issue is the regular malfunction of the keystone adjustment tool when making simultaneous vertical and horizontal adjustments using the four adjustment points. The expected result of such adjustment is a rectangle with two horizontal and two vertical sides, but instead of this you often get a parallelogram in which the sides that were supposed to be vertical aren't actually vertical.
Below is a part of what I've sent to support.
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What I expect the keystone correction tool to do is the following:
Regardless of the content of the photo, and regardless of where or how you place the four adjustment points, as long as you have a four-sided figure, the result of applying corrections should be a rectangle with two completely horizontal and two completely vertical sides. Again, the content of the photo is irrelevant here, and so is the distortion that may result from the adjustment (extreme settings will produce extreme results with most other adjustment parameters as well). If for some reason C1's keystone correction tool doesn't work in this way, it should at least be stated clearly in the user guide along with a description of what it can and what it can't to do.
That you may be able to produce the desired result using the adjustment sliders is another matter. The main point here is that keystone correction using the four adjustment points produces unexpected results. If this is due to a limitation in what the keystone tool is able correct, it should be stated in the user guide, so users would know what results to expect – preferably with an explanation of why the tool is limited in this way, when corresponding tools in other RAW editors do not have such limitations. If this limitation isn't intended, I assume the tool isn't working as it should, and I hope that it will be fixed in the next update.
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