Hello,
Thank you very much for choosing our theme and for contacting us.
1. Please deactivate all the plugins not related to the theme and switch the parent theme, check the issue, if the problem remains, leave the plugins not activated and provide the site admin access to the private area
2. The portfolio page works in this way: all the posts are presented randomly, at the same time the filter is provided to sort out necessary ones.
3. This is caused by different length of the title https://prnt.sc/sg31rz I can provide custom CSS to make the fixed height of the title, however, some short titles would have gaps
4. This is the way such configuration works. This is one and the same page without pagination.
Best Regards