HDR just replicating first image in stack - has no effect

[OldScout]

Shooting a 5-shot AEB using 1 stop split (0, -1, -2, +1, +2). The same day as I shot them, I successfully HDR merged these 5 images into satisfactory HDR images using a 5-shot stack. Now today when doing the same process, the resulting HDR image is simply an exact duplicate of the 0-EV image (Image 1; see included image). HDR = 0-EV image. I've also tried selecting the 5 images not using a stack but got the same results. Restarted machine. Checked drivers. No help.

Has anyone else experienced the same issue? Any suggestions on a fix? Thanks in advance.

[OldScout]

**ETA: Problem Solved. I simply overlooked "Auto Settings" in the HDR dialogue box. It was unchecked. Once I checked it, it performed as expected.

[Ian Lyons]

It shouldn't be necessary to use 5 shots in a HDR spread over -2 to +2 stops. This Adobe document provides guidance on the ideal number https://helpx.adobe.com/uk/lightroom-classic/help/hdr-photo-merge.html