Custom fields will not display on the frontend

I have a similar problem .

web link is visible in some items, but not in others.
www.uninternet.org/web7.0/
I created another field to verify a possible error, but also some web links are visible and others not.
From phpmyadmin I see that all data is in table flexicontent_fields_item_relations

I tried with several browsers, I deleted the cache.
I have flexicontent 2.5

What could be the cause that can not see it?

A custom field visible only in some items ???

Please check that all these items use the same Item Template Layout OR use if they use different double check that you have added the field in all Item Template Layout

If you have verified the above then could some plugin you have installed be removing the links?

phpMyAdmin:

be viewed:
field_id int(11) 19
item_id int(11) 18450
valueorder int(11) 1
value mediumtext
a:3:{s:4:"link";s:19:" www.zhaw.ch/";s:5:"title";s:48:"Zurcher Hochschule fur Angewandte Wissenschaften";s:4:"hits";i:15;}

can not be see:
field_id int(11) 60
item_id int(11) 18450
valueorder int(11) 1
value mediumtext
a:3:{s:4:"link";s:19:" www.zhaw.ch/";s:5:"title";s:48:"Zurcher Hochschule für Angewandte Wissenschaften";s:4:"hits";i:1;}


in this case the only difference is "ü"
is this the cause? special characters?

yes special caractère is not alow in NAME