Version 6.6.3 build 1988 "Pro": In the preview pane, colors appear to be incorrectly assigned: instead of a color per search token / word (reused for all pages), the color is the same for all search tokens on a given page, but changes from page to page. In the search word occurrence pulldown, the colors are as - presumably - intended (one color per token).
Quote: In the preview pane, colors appear to be incorrectly assigned This is a macOS bug in the PDF view that Apple introduced in macOS 10.10 (IIRC), and only fixed in macOS 10.15.