Tools swap and change without my orders

WillRez  wrote Here are my problems I have been having over the past few months

If you have Artboards, then you are using Photoshop CC, so have the option to customise your Toolbar, and save it along with custom workspaces.  I hate using the Shift key to toggle between tools (it slows you down) so I have it unchecked in Preferences.  I also remove the shortcut for tools I rarely use, and just select via their icons.

This is how my Toolbar looks for my most used workspace.  I don't use artboards so have removed the artboard tool completely.  If I hit the B key, I will always get the normal brush, but I do  occasionally use the Mixer brush, so I Select it directly from the Toolbar.  It takes up very little space having a two column Toolbar with all regularly used tools having their own spot.

The ability to save Toolbar layouts along with shortcuts and menus is incredibly useful.  Most shortcuts are already used by Photoshop.  In fact some already have more than one use (the Motion workspace switches shortcuts like Ctrl n to a Timeline specific use for instance).  So you can borrow shortcuts from seldom used functions, and save with a workspace, and switch back to Essentials when you need the default use.  

I switch between workspaces using the programmable 'G-Keys' on my Logitech G910 gaming keyboard, and it saves me a ton of time.

In fact I love the one key selection so much that I also have a Razor Orbweaver

If you go to Preferences/Tools/ you can select "Use Shift Key for Tool Switch". This will require only the Letter for selection between tools but will require SHIFT-Letter to switch between tools in the same toolbar slot. So if you have the Move tool, selecting B brings up the current brush tool but pressing B again will not select the next brush, but SHIFT-B will.

a. I click on the brush tool, (or press B,) and the tool automatically changes to Mixer Brush Tool, instead of the first option which is Brush.

What is the Preferences > Tools > Use Shift Key for Tool Switch setting?

2. Another strange one, if I for example select four layers and attempt to move them, it will without fail remove one of the layers as I begin to drag them with the move tool.

What are the Move Tool settings in the Options Bar?

Is your shift key stuck? That will cycle the tools if you use keyboard shortcuts. Or maybe the mouse left click is stuck, sending out click-hold instead of just click.

Either way, this is unlikely to be Photoshop, especially if you already did a preferences reset and that did nothing.

You have not provided any system or version information or other tzechnical details, so we can't tell you much. simply sounds like you have issues with your input device.

Mylenium