Hello,
Reason is that resizable feature is not working correct with Internet Explorer. We will remake it in new version. We did not found solution to make it working in IE unfortunately, solution is disable it for IE and use usual textareas (without resizable feature)
Fix
Open templates/your_template/tpl/blocks/fields_add.tpl
find code
Code:
Only registered members can view the code.
replace with
Code:
Only registered members can view the code.
Same with another file templates/your_template/tpl/blocks/fields_edit.tpl
In case you have problems with it request help from our techs in chat or tickets.