files not exporting correctly, HTML file not exporting at all??

hi, just trying to update my site, and the files are not exporting correctly. the HTML file is not updating, and the assets files are hit and miss. ive triple checked the export destination, and i havent moved anything, changed any settings or changed anything except a little text.

ok, i logged out and back in, and none of my changes (couple of hours work!) are being saved. and it is saying your page has been exported, click to see files.