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I use Kaspersky Internet Security. This opens the so-called secure browser when paying with PayPal, and this process then runs within Microsoft Edge. When the payment is completed, the browser switches back to the previous browser or browser window. This switch does not seem to work properly with your website. I do not normally have this problem on other websites. If a payment with PayPal does not work, an error usually occurs and the payment is not made. Here, however, the payment is made, although the return to your website appears to be such that the payment is not recognized or is not switched back correctly.