Hello,
sorry for keep you waiting.
As we see you have Revelance theme, so please open your abdev-portfolio.php file
(you can find it in elements folder here \revelance\wp-content\themes\revelance\elements\ab-dev-portfolio.php)
and on line 24 you have this code:
'default' => 8,
Please replace it with 'default' => '8',
As you can see difference is only in single quotes.
Now should portfolio element would work fine.
Same thing in ab-tweet-scroller.php (in same folder elements) at line 23
'default' => 5,
replace this with 'default' => '5',
and check single quotes on lines 61, 95 and 112.
If you still have issues with this please send us your WordPress credentials in a private field so we can take a closer look :)
Kind regards