it was to see the soldering points, sometimes strange chars are caused by wires that short(?) every now and then. Although not sharp it looks like the soldering is not the issue here.
4.95 Volt seems high enough,
I still have the feeling it is some hardware failure as there is an image in which the 75 is in the right place but the rest is wrong. That implies that the bytes are send well to the LCD. Do you have another LCD to test if the cause is in the LCD (+wiring) or in the Arduino + temp sensors?