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Look at the center picture. It doesn’t simply say 7.5VDC on the label…..it says 7.5VDC while 1.5A is being drawn. You’re taking a reading at "no load"……were you to draw 1.5A, the voltage would fall to the advertised 7.5VDC.
I can’t read the other labels, but I’m sure it’s the same situation: you’re not reading "loaded" voltage, but rather no-load voltage.
The degree to which the advertised loaded voltage goes up during a no-load voltage is called "regulation", and depending on the design of the power supply can vary from perfect regulation where no-load voltage = loaded voltage (best) to absolutely dismal regulation where the NLV skyrockets.(worst).
The follow-up question is, of course, "can these be used in your application?", and to know that, you need to know not only the voltage requirement of your application but also how much current your application will draw. That is a key factor.