Asics made som unexpected changes to their services around February 9th, which unfortunately broke the RunKeeper integration.
The issue was fixed in version 2.82 on the App Store.
Since Asics stopped providing 3rd party developers acces to their "Open Graph" API back in 2017, apps like RunGap have to rely on undocumented methods and web-automation in order to keep the integration running. This is bound to break from time to time whenever their developers decide to modify their code. I will continue looking into this until it either works for all users (if possible) or RunKeeper no longer is supported by RunGap.
Thank you for your patience.