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Wishlist issue - adding new items/products is buggy

Wishlist issue - adding new items/products is buggy

 I use CE (magento-,  the version added on Feb 23, 2016.

I'm having problems with the add item function of the wishlist.
It usually works for the first 3 items, but if I add the 4th item, the 3rd gets deleted. I checked the database in real time while Magento was loading right after I clicked "add to wishlist", and at first there were 4 items in the wishlist_item table, but after Magento finished loading, the 3rd was deleted while the 4th remained.
This happens with the core app\code\core\Mage\Wishlist module.


Now the interesting part is that if I comment out row 220 in Wishlist/controllers/IndexController.php, function _addItemToWishList():


the wishlist suddenly works. I can't make any sense out of it.

I'd like to know more about this, if anyone has encountered the same problem before or knows what's causing this. My temporary fix seems to work, but I'd like to investigate further out of curiosity.

This does not seem to be an issue with a clean Magento installation, but rather something happening in our system (maybe extensions interfering?)
A list of our extensions:
VS_Ajaxscrolling 1.0.0
mpps 1.1.3
m2epro_ebay_magento 6.4.3
FireGento_MageSetup 2.2.2