hit this on a woo/wp site and figured it's worth writing down before someone else marks a design task done too early.

i was making design/css changes, mostly on static pages. the layout kept looking broken. when i added a query string to the url, the page looked correct. that usually means something is serving an old cached version.

i cleared the normal caches: browser, private window, wp/plugin cache. still broken. later i purged the server/cdn page cache and the design came through properly.

so the checklist i use now after design-related changes:

1. check in a private window

2. clear wp/plugin cache

3. if it still looks wrong, purge server/cdn page cache too

4. only then mark the task done

plugin cache alone is not always the full stack. if a query param fixes it but a normal visit doesn't, look one layer higher before rewriting css again.