Curious behavior emptying trash : negative number of items

Lately, when I empty the trash from within Zotero it appears that the (empty) trash has a negative number of items. See screen shot. In this case the number is -3.

https://www.dropbox.com/s/3plvxry9lvd29sq/Screenshot 2015-05-31 14.30.12.png?dl=0

There seems to be no problem with my database from the integrity test. Everything seems normal with Zotero Stand-Alone. If I close Stand-Alone and re-open it the negative number is still there. If I close ZSA and open the FireFox version there are "no items in this view" in my trash. Upon closing ZFF and opening ZSA the negative number goes away and all is normal.

I'm using ZSA 4.0.26.3. Mac OS 10.10.3.

I want to be sure that this is not a hint that something bad might be lurking behind the scenes.
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