1) Short Explanation of the Issue
If discounted products correctly show strikethrough pricing on the product page, but not on collection pages, the issue is usually caused by your Shopify theme’s default pricing logic.
Most Shopify themes render collection pricing using built-in rules that:
Only show Compare-at price if specific conditions are met
Ignore dynamic storefront display logic
Override custom discount visualizations
Cache collection card pricing separately
This is typically a theme-level limitation — not a campaign calculation problem.
2) Quick Check (Checklist)
Before proceeding, confirm:
The campaign is Active
The product is included in the campaign
The discount appears correctly at checkout
The product page shows correct sale formatting
The product has a valid Compare-at price
The collection page is refreshed in Incognito mode
No other price app is modifying collection cards
If product page works but collection page doesn’t, the issue is almost always theme rendering logic.
3) Step-by-Step Solution
Step 1 — Confirm Compare-at price logic in Shopify
Go to Shopify Admin → Products.
Open the affected product.
Confirm:
Compare-at price is higher than the actual selling price.
Save the product.
Refresh collection page.
Some themes only display strikethrough when:
compare_at_price > price
Step 2 — Test if the theme supports collection sale badges
Go to Online Store → Themes.
Click Customize.
Open a Collection template.
Check if product cards have:
“Show sale badge”
“Show compare-at price”
“Enable sale pricing”
Enable them if available.
Save changes and retest.
Step 3 — Inspect how the theme renders collection pricing
Most themes use a file similar to:
card-product.liquidproduct-grid-item.liquidprice.liquid
Inside these files, pricing is often controlled by logic like:
{% if product.compare_at_price > product.price %}If your discount system does not modify Shopify’s base product price, the theme may not detect it as “on sale.”
This is expected behavior for many modern themes.
Step 4 — Check for price app conflicts
If you use:
Currency converters
Dynamic pricing apps
Bundle apps
Custom JS pricing scripts
They may override collection card rendering.
Temporarily disable other pricing apps and retest.
Step 5 — Clear storefront caching
Collection pages are often cached more aggressively.
Test using:
Incognito window
Hard refresh (Ctrl+Shift+R / Cmd+Shift+R)
Different device
Different browser
If the product page updates but collection page does not, caching is likely involved.
Step 6 — Understand theme limitation (Important)
Many Shopify themes:
Only show compare-at pricing based on Shopify’s native product price fields.
Do not dynamically reflect app-based price presentation changes on collection cards.
In such cases:
The discount works.
Checkout is correct.
Product page may be correct.
Collection card rendering is theme-restricted.
This is not a pricing calculation issue.
4) When Should You Contact Support?
Contact support if:
The discount does NOT apply at checkout
Product page also does NOT show sale pricing
Compare-at price is properly set but neither page reflects it
You suspect JavaScript conflicts
You need guidance modifying theme pricing logic
When contacting support, include:
Store URL
Theme name and version
Product URL
Collection URL
Screenshot of product pricing settings
Screenshot of campaign settings
This allows faster technical diagnosis.