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
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I think there were several similar threads and it was related to the Joomla template (no time to search at the moment)On the second page i get the first line get pushed to the right.
I don't know what domPDF is injecting at page start, but I can replicate the issue.
It should be ok with adding to
#listform_$c .row-fluid .span4 {
...
margin:0;
}
and to remove
<h1><?php echo $this->table->label;?></h1>
in default.php line 35
Don't ask why but this way its working on my site.