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An annoying default in TinyMCE is that if you paste code into the HTML window, e.g. an iFrame, it is automatically wrapped in paragraph tags. This makes it difficult to format the object and can sometimes break the W3C page validation.
There may well be a later version of Tinyeditor and the default may have changed, but if you have 3.3.9.2 and also find this is a nuisance, the default behaviour can be disabled.
class/xoopseditor/tinymce/settings.php
Just underneath:
"force_hex_style_colors" => true,
add:
"forced_root_block" => false,
Note that this still allows the correct creation of paragraph tags on pressing enter.
HTH