Revolution Concealer C1 No Longer Matches Original Light Shade

The shade of the Revolution concealer I always use has changed. I have been using Revolution Concealer shade C1, the lightest shade, for about a year, and I’ve finished five or six tubes. However, the C1 concealer I recently bought from Watsons came out noticeably darker.

Unfortunately, I threw away the receipt, so I’m unable to exchange it. I am requesting an explanation regarding this issue. I started wondering whether C1 was out of stock and another shade was labeled as C1, whether the formula was changed and affected the color in the packaging, or whether the shade itself was intentionally made darker. In the photo, the lighter shade is my previously used product, while the darker, altered tone is the newly purchased one.