Unfortunately, there was nothing in the file. I recreated it but this time with two sheets with different ordering of precedence; on one sheet the range B1:B3 conditions were done first, the second the reverse is true.
cf_overlap.ods (10.1 KB)
When I open Format > Conditional > Manage the condition with precedence is highlighted even if it is second in the alphabetical list as shown in your screenshot.
Therefore the highlight indicates precedence.
I added a comment to the bug 148154 – Reordering Conditional Formats in Manage CF dialog


