Price difference on specials when delivered to different areas

Really shocked at what I just found. I ordered a few specials on the Checkers 60/Sixty app and then realised my delivery address was my work address which is Thornton. I then updated it to my home address which is in Lansdowne and then noticed a price change on the specials.

The Pampers Size 7 pants is priced at R199 when delivered to Thornton but when I changed to Lansdowne address it’s priced to R219. Same goes for Omo R99 and then R109.99 when I change the address. I took screen shots of many other specials where this has happened.

So disappointed with this find. Shame on your Checkers