GameStop said the promotion has now been updated and the loophole has been closed. The retailer also reminded customers that its stores are not meant to generate unlimited credit.
The incident comes as GameStop continues to reduce its physical store footprint across the United States.
The issue was first highlighted in a video shared on YouTube.
Experts say similar pricing errors have affected other retailers in the past, especially during high demand product launches. Automated systems can struggle to balance resale value and promotional offers at the same time.
GameStop said it continues to review its trade-in programs to avoid future pricing discrepancies and customer confusion.
Retail experts say incidents like the GameStop store credit glitch highlight the risks of automated pricing systems during high-demand periods. Even small valuation errors can lead to unexpected losses when trade in programs are repeatedly used.
This follows other recent GameStop news coverage.
