oisit

Was self resolved.
Added display option setting was on.
I improved it when it was turned off.

custom-field-template.phpの2578行目と3350行目を対象にWarning: A non-numeric value encounteredが表示されるので何か対策をしていただけると幸いです。
とりあえず（int）を追加することでWarningは消えました。

2578: if ( isset($post_id) ) $addbutton = (int)$this->get_post_meta( $post_id, $title, true )-1;
3350: else if ( isset($_REQUEST['post']) ) $fieldsetcounter = (int)$this->get_post_meta( $_REQUEST['post'], $title, true )-1;

function load_custom_fieldのcategoryあたりは正常に機能しているのでしょうか。
あとプログラムの経験が足りてないんで個人的に判断しかねるのですが、
endif;;
という書き方があるんでしょうか。

>Furthermore the images are very small in the mobile version. Is it possible that it chances from 4 columns on desktop to 2 columns in the mobile version?

This is google’s translation.
I am a Japanese who can not speak English.

If you change the display setting to Masonry, it becomes 2 columns on mobile.

However, if the number of lines varies depending on the number of characters such as the title, the top of the image is not aligned.
This is the same on the full screen.

I think that it is adjusted with javascript, but I do not know which part of which file to customize.

Please answer someone.