In Touch Ui edit mode half of the page is not loading does anyone faces a similar type of issue as we are using AEM 6.3
Please check your HTML file maybe there is a problem in some class you been using in your code .
Check the below thread
AEM 6.1 SP1 Component height not calculated correctly in edit mode touch UI
Also you can perform a force a recompilation of all Sling scripts jsps, java, and sightly:
How to force a recompilation of all Sling scripts jsps, java, and sightly in AEM 6.4
This probably caused by one of the components whose css is not working as expected. Try to go to the jcr:content of the page in crxde and try to remove the components and check which one caused it.