Exporting for online Type Tester REWARD

Hello, some of our fonts are having issues when exported and in OTF format and being used in our type tester which is supplied by http://www.type-applications.com .

The problem is the fonts ignore the kerning, guessing the error is to do with the GSUB or GPOS AFDKO or some exporting issue.

If we provided someone with a glyphs file that worked fine vs one that does not, would someone please be able to help spot the error and provide a fix?

We are willing to provide a small reward via PayPal if someone can fix this issue for us.

Fonts do not ignore kerning, apps do. In which app did you test your font?

Have you tried in different browsers?