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Radically different backup sizes

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After the drive swap discussed in this thread, I've made two backups.  The are radically different sizes -- they can't both be valid backups. See screen capture below.  I've repeated the latest backup (the small one) twice and it's way too small both times.  What's happening?

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From your picture it looks like you created a new backup task. By default the first backup is always a full and subsequent images are incremental. The names from your original backup show only full backups To Western Digital_full _b16_S1_v1 and full_b13_s1_v1. The second set of backups show that the task is incremental. 500GB_full_b1_s1_v1 followed by 500GB_inc_b1_s3_v1. If you want only full backup images you need to choose the Custom option in the Backup Scheme settings the default scheme is incremental. Incremental images are much smaller because only the differences between the first full and next image are backed up.