I have a Harlem Globetrotters. All the score displays work fine as long as you haven't rolled the score. Once the score is rolled the 100,000 digit and the 10,000 digit mess up. The number 2 will display as a backward 6. The number 5 will display as a 9 and the number 6 will display as the number 8. And all the displays do the same thing if the score is rolled on that display. As long as the score on that display hasn't been rolled it works fine. I swapped out the RAM chip thinking that might be the issue but it didn't change anything. When I run it through the display test all numbers display correctly. Any idea what could cause this?