Previously, the payments have been tagged to 2220, but with the 'Post Net Wages to Balance Sheet' being turned off, it automatically creates a second posting to the P&L account (check 2220 on 01/02/2016).
The entry to 2220 on 29th February has been introduced because of a journal (Month 11), which as I mentioned above seems to post to 7003 rather 2220.
Month 11 is the only journal that I can see that posts to 2220. If you could tell me what other journals you have changed please, I'll take a closer look for you?