A/C starts up on "Auto"; never did before

[workingonit]

After installing a TYC replacement Aux fan yesterday, I was outside adjusting the turn-on temperature for the other electric fan I installed earlier. I accidentally moved the dial and wasn't sure where I had it set before (I marked it well with a Sharpie this time).

I turned off the A/C to keep the Aux fan from running so I could set the adj. thermostatic switch, but noticed that I couldn't turn off the "auto" button. It hadn't been on full-time before, and when I had previously pushed it, it either was on or off.

I was pushing all the buttons previously, when I first had the A/C compressor fail to run a week ago, and might've pushed them a bit hard, so I possibly damaged the "auto" button.

Here's what the owners manual says about how to turn the "Auto" button off (but no mention about the "Auto" button acting as an on/off.

"You can cancel the AUTO program by selecting specific air distribution patterns for your personal comfort. You can direct air to flow onto the windows , toward the upper body , and into the footwell .
Temperature You can make individual temperature adjustments on the driver's side or the front passenger side. Your settings will be shown in the display 9. The displayed temperatures are reference values for the interior temperature. We recommend +72 7 (+22 6) as a comfortable setting, whether the air conditioner is operating or not. When you start the vehicle, this system ensures that the selected temperature is achieved as quickly as possible. It then maintains this temperature, regardless of the season.
Set the rotary dial 3 (refer to "Draft-free ventilation" on page 110) to a medium position to provide somewhat cooler air. This helps to promote driving without fatigue. Utilize this method of mixing air especially for making minor adjustments for personal comfort.
You can set uncontrolled heater output up to +90 7 (+32 6). Full cooling output is available from the air conditioner down to +60 7 (+16 6).< Online"

I have no problem with the way the button is supposed to work as it does now, but what changed the function from before?

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