Cursor unexpectedly jumps to end section while trying to edit credit card number from middle section.

Steps

1. Open https://www.mec.ca/en
2. Add any product
3. Open cart and tap on Checkout
4. Login
5. Input shipping & billing address and proceed to payment section
6. Input card number >> place the cursor between in the inputted card number and try to edit

Actual result

When user place the cursor between in inputted card number and then tries to edit- cursor unexpectedly jumps to end section.

Expected result

Expected to edit the card number from middle section.