App displays correctly on webos 6.0 simulator and is broken on webos 6.0 emulator

Our web hosted app was bounced back from Q&A with a broken layout report. We can reproduce the issue on the webos 6.0 deprecated emulator but it displays flawlessly on the recommended simulator tool running webos 6.0 webos TV 22 and webos TV 23. How come the emulator and simulator running the same webos version throw different results? Do the emulator and simulator run different chromium versions if so which in each case. Could you give us any more details which my help us debug the current issue?
Thanks for any hint.

webOS TV supports two types of app resolution: 1280x720 and 1920x1080. All FHD TV models support 1280x720 apps, and most UHD TV models support 1280x720 and 1920x1080 apps. However, some UHD TVs have lower specs than others, so only 1280x720 apps are distributed. If you use width: 100% and height: 100% in your app, it will not display correctly on these UHD TVs. To distribute your app without resolution issues, please submit two packages: 1280x720 and 1920x1080. And use width: 1280px and height: 720px and width: 1920px and height: 1080px in your app HTML container. Thank you.