Hi,
Looks like we have made a mistake. Thanks for raising this issue.
It is easy to patch though,
1- open this PHP file:
/templates/flexible_lightmart/html/com_virtumeart/cart/default_pricelist.php
2- Find these 2 lines:
<input type="text" name="coupon_code" size="20" maxlength="50" class="flexibleCouponInput" autocomplete="off" placeholder="<?php echo (empty($this->cart->cartData['couponCode'])) ? JTEXT::_('TPL_FLEXIBLE_APPLY_ENTER_COUPON_CODE') : $this->cart->cartData['couponCode'];?>" value="<?php echo (empty($this->cart->cartData['couponCode'])) ? "" : $this->cart->cartData['couponCode'];?>"><br/>
<input class="flexibleButton" type="submit" name="setcoupon" title="Save" value="<?php echo (empty($this->cart->cartData['couponCode'])) ? JTEXT::_('TPL_FLEXIBLE_APPLY_DISCOUNT_CODE') : JTEXT::_('TPL_FLEXIBLE_APPLY_ANOTHER_DICSOUNT_CODE');?>" >
3- Replace them with these:
<input type="text" name="coupon_code" size="20" maxlength="50" class="flexibleCouponInput" autocomplete="off" placeholder="<?php echo (empty($this->cart->cartData['couponCode'])) ? JTEXT::_('TPL_FLEXIBLE_APPLY_ENTER_COUPON_CODE') : $this->cart->cartData['couponCode'];?>" value=""><br/>
<input class="flexibleButton" type="submit" name="setcoupon" title="Save" value="<?php echo (empty($this->cart->cartData['couponCode'])) ? JTEXT::_('TPL_FLEXIBLE_APPLY_DISCOUNT_CODE') : JTEXT::_('TPL_FLEXIBLE_APPLY_ANOTHER_DISCOUNT_CODE');?>" >
This should fix the "Looping" problem. TESTED & CONFIRMED.
Regards.