Aizaz Imtiaz Awan
1- Sorry for the inconvenience but if Revolution Slider or some other plugins are incompatible with certain Hosting Provider(s) then unfortunately we can’t do much about that because this concern is specifically from their end so we can’t say much about that.
Although, if you are unable to use the Revolution Slider you can try using the Theme’s default Slider. Here is the guide to that:
Further, if you want to import all the default Sliders on your Site you can go to Dashboard > WoodMart > Prebuilt websites > there click on Additional Pages > there you can search for Sliders > and you will get to import the Sliders page where you can find all the Sliders: https://snipboard.io/DtIHK0.jpg
2- Regarding the space after the Header, sorry to say but it seems that you have changed the Login details so we are unable to proceed further to check this issue on your Site. Also, your Site is password protected to view so we are unable to view it too.