Unfortunately, the badges used by many extensions (including this one) can only display up to 4 digits. The previous way had a + (plus sign) being displayed, however, it didn't work quite well on Windows. This way, it works in all systems.

I can add a setting to toggle the current suffix, but I'm not sure if you'd be pleased by having, for example, 12345 being displayed as 1234 in the badge.