I already posted this on the report bugs forum

K2 (i found this problem on k2 2.4.1) cant render columns properly (it wont fill the width of the page) if items or subcategories are less than 2 items.
line 89 (for sub categories)
<div class="subCategoryContainer<?php echo $lastContainer; ?>"<?php echo (count($this->subCategories)==1) ? '' : ' style="width:'.number_format(100/$this->params->get('subCatColumns'), 1).'%;"'; ?>>

line 151 (for leading articles)
<div class="itemContainer<?php echo $lastContainer; ?>"<?php echo (count($this->leading)==1) ? '' : ' style="width:'.number_format(100/$this->params->get('num_leading_columns'), 1).'%;"'; ?>>

line 179 (for primary items)
<div class="itemContainer<?php echo $lastContainer; ?>"<?php echo (count($this->primary)==1) ? '' : ' style="width:'.number_format(100/$this->params->get('num_primary_columns'), 1).'%;"'; ?>>

line 207 (for secondary items)
<div class="itemContainer<?php echo $lastContainer; ?>"<?php echo (count($this->secondary)==1) ? '' : ' style="width:'.number_format(100/$this->params->get('num_secondary_columns'), 1).'%;"'; ?>>

line 236 (for link items)
<div class="itemContainer<?php echo $lastContainer; ?>"<?php echo (count($this->links)==1) ? '' : ' style="width:'.number_format(100/$this->params->get('num_links_columns'), 1).'%;"'; ?>>

I managed to fix these by changing the second statement, removing the count command and appending the style after the echo.

See example below for sub categories.

<?php echo ' style="width:'.number_format(100/$this->params->get('subCatColumns'), 1).'%;"'; ?>>

I basically removed the

(count($this->subCategories)==1) ? '' : (for sub categories)

(count($this->leading)==1) ? '' : (for leading items)

(count($this->primary)==1) ? '' : (for primary items)

(count($this->secondary)==1) ? '' : (for secondary items)

(count($this->links)==1) ? '' : (for link items)

Can any of the developers please confirm? I'm testing my site and its working fine now, but I just want to make sure i'm doing it right.

Thanks guys and looking forward to your response.