For running J!5.1 you must https://fabrikar.com/forums/index.php?wiki/update-from-github/ or include the new file manually https://fabrikar.com/forums/index.php?threads/joomla-5-1-and-fabrik-cannot-find-files-error.54473/post-285151 See also Announcements
Please see our announcement here.
Yes. Only a part of the entries are displayed. This is so strangeHave you tried activating "Debug PDF" in Fabrik options? You should then see the PDF output rendering on screen (basically the same as it would in PDF format), and you may be able to see or find out what's wrong.