Closing a tab switches to a seemingly random tab instead of the next tab in order.

I have several tabs open which represent 2 different projects. Tabs/mockups A1-A5 are project 1 and B1-B3 are project 2. I am done with project 1 so I would like to close all A tabs (which start with the same name) so that I can focus on project 2. I have A1 open and press ctrl+w to close it. It closes and Mockups switches to tab B2, forcing me to click on tab A2 before I can close it. This pattern repeats, with Mockups always going to B2 after a tab is closed. I would like to hold down ctrl and press w 5 times to quickly close all 5 A tabs. The close tab order should also be alphabetical/left-to-right.